In this society firemen don’t put out fire, instead to ignite fire. Is it an ironic element? Can you see another?
There is irony to the fact that firemen create fires in "Fahrenheit 451". A deep irony to the story is that the people in that society think they are free to do what they want. They think they have a good society because they have time to play and they don't have to spend much time or effort in staying on top of what is happening in their society. News has been condensed, we are told, and delivered to the people in a short, concise manner. What isn't said, but is implied, is that the news that is given to the people is what the media (and probably the government) want the people to hear. People are anything but free in the society of the book. They are methodically led to be occupied with mindless fun so that they don't occupy themselves with learning or finding out what is really going on in their society. Their society obviously has some serious issues because of the war that occurs at the end of the story.