Why does Brutus believe it's necessary to kill Caesar in Act 2, Scene 1?

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In the "seduction scene" of Act I, Cassius lures Brutus into thinking that Caesar perceives himself as a god, referring to Caesar ironically as "immortal Caesar" and by strengthening his argument that Caesar has become too powerful with allusion:

Why, man, he doth bestride the narrow world

Like a Colossus, and we petty men

Walk under his huge legs and peep about

To find ourselves dishonorable graves. (I,ii,135-138)

Then, in Act II, alone in his orchard, Brutus ponders the words of Cassius and the events of the day in which Marc Antony has tried to put a crown upon Caesar's head, but ostentatiously Caesar has refused it.  Brutus also considers that Caesar has slain Pompey, who was his ally.  Persuaded by the arguments of Cassius that Caesar wishes to be emperor and sole ruler of Rome, Brutus considers the assassination.  For the public good, Brutus reasons, Caesar must be killed:

Th' abuse of greatness is when it disjoins

Remorse from power; and, to speak truth of Caesar,

I have not known when his affections swayed

More than his reason.  But 'tis a common proof

That lowliness is young ambition's ladder,

Whereto the climber upward turns his face;

But when he once attains the upmost round,

He then unto the ladder turns his back

Looks in the clouds, scorning the base degrees

By which he did ascend.  So Caesar may;

Then lest he may, prevent. (II,i,18-28)

Brutus reasons that he has no personal reason to rebel against Caesar, but Caesar, who has always been rational rather than emotional in his rule, may "climb the ladder" and, once, in power, forget abandon humility as so many have done before. Brutus fears that Caesar may be

...a serpent's egg

Which hatched, would as his king grow mischievous,

And kill him in the shell. (II,i,32-34)

That is, once he attains such power as has been offered him by Marc Antony and the people, Caesar may change and become tyrannical.  The idea that Rome "stand under one man's awe" (II,i,52) is so disturbing to Brutus that he makes Rome a promise to "redress what will follow" (II,i,57) and act for the good of Rome by preventing Caesar from becoming a tyrant.

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In what is known as the seduction scene of Shakespeare's "Julius Caesar," Brutus has been convinced in Act I, Scene 2, by his friend Cassius that Caesar is

like a Colossus, and we petty men/Walk under his huge legs and peepabout/To find ourselves dishonorable graves...When could they say [till now] that talked of Rome,/That her wide walks encompassed but one man?

So convincing is the envious Cassius that Caesar wishes complete power that Brutus promises to consider what his friend has said.  Later, in his soliloquy in the opening scene of Act II, Brutus convinces himself that Caesar must die, not because he has abused power, but because he may do so in the future.  Indeed, Brutus is so seduced by the words of Cassius,  believing that he himself  perceives a reason for preventing Caesar to continue to lead Rome when, in actuality, he merely echoes Cassius's thoughts, saying that he must be stopped, in case he may desire complete power.

...But 'tis a common proof/That lowliness is young ambition's ladder./Whereto the climber upward turns his face;/But when he once attains the upmost round,/He then unto the ladder turns his back,/Looks in the clouds, corning the base degrees/By which he did ascend.  So Caesar may;/Then lest he may, prevent.

The irony here, of course, is that when Brutus should not have listened to Cassius, he does; when he should listen to Cassius in the later acts as they go to battle in Philippi, Brutus does not. Perhaps, Brutus wishes to think for himself after having been so swayed by Cassius that he killed his friend.

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Brutus believes it is necessary for Caesar to be killed because he believes that Rome will be better off if it is run by the senators, as opposed to a single ruler.  He fears that not only will Caesar become a dictator of Rome, but also that that is what Caesar desires.  In order to preserve the Republic, Brutus sees no other solution than to kill Caesar, even though they are good friends and have respect for one another.  Of all of the conspirators, Brutus seems to be the only one looking out for the good of Rome; the other men seem to have personal gripes against the new ruler.

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Brutus believes that Julius Caesar needs to be killed to protect the Roman political system.  He thinks that Caesar wants to have too much power for himself and that this would be bad for Rome.

Up until this point, Rome had been a republic.  But Caesar has been getting more power for himself and seems to be on the verge (in Brutus's eyes) of turning Rome into a monarchy.  He believes that Caesar has become too popular and that the people will make Caesar a dictator because they like him so much.

Brutus feels that Caesar must be killed so that the Roman Republic might be able to continue.

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