Plop Laertes into the 21st century
Let's imagine the revenge tragedy in modern times. Claudius is a psychopath who kills his way to the top and then kills his way out of his problems -- maybe like a mafia don.
But Laertes? Who is his modern counterpart? Would this generic youth be manipulated to so cold and bold a deed as murdering Hamlet right before his mother's eyes, in the Danish court? Or do we have to rely for his participation in Claudius's plot on the conventions of the day (or of the play)?
Shakespeare depicts a world in which:
Men walk around with deadly weapons on them all the time with the intent to do business -- Hamlet draws his rapier twice in the play for such purposes, once to threaten his friends against stopping him from conferring with the ghost, and once to ram it through an arras into an unseen victim.
It is assumed that if Hamlet kills your father, you will kill Hamlet, even if your father was a tiresome windbag and you couldn't wait to get away from him and party in France (I don't see direct evidence in the text that Laertes was studying). You don't go to the authorities and demand an investigation, you don't go to the streets and scream "Hamlet did it!"
Obviously, I'm struggling with Laertes' psychology! Is he a creature of his time? Or can you envision him getting entangled in a murder plot nowadays, a dupe with little self-awareness? He lists plenty of reasons for Ophelia to "fear" things, yet he is the hot-headed foil to Hamlet.