I would say some atheists do.
Why do they try to convince people there is no god? Much for the same reason you might try and convince people there is a god. Its hard for some people to listen, witness, interact etc. with something that they believe isn't true without speaking up about it.
Speaking up when something is spoken that contradicts your beliefs is one thing, and it's something that occurs within the context of regular conversation. Seeking people out to determine their beliefs, specifically
targetting those who you suspect may NOT believe as you do, ...and then proceeding with unsolicited statements about your beliefs, ...then trying to convince them otherwise, or engage them in a conversation to which they want no part, is a completely different thing. I don't believe atheists do that as a general rule. The same cannot be said about others though. Infact, ...some groups make it a mandatory coming of age requiring you to do just that for a few years.
I think the difference is some radicals immerse themselves so fully in the culture of their belief that they don't understand what they're doing. And there are so many of them EVERYWHERE that people have come to accept their extremism as a normal part of life, ...but there is nothing normal about it.
Their choice of suppliers is often dictated by this. Little things like personal stationary, or sending birthday cards for instance. There are plenty of online greeting card companies, ...but some people immerse themselves so deeply that even their personal stationary or post-it notes have to include some verse to whatever personal religious belief they have. If you have to leave a note on the door for FedEx or UPS, ...is it necessary to including verses from your particular religion? If you want to wish someone a happy birthday, ...is it necessary to include a verse from your particular religion? When was the last time any of us got a greeting card from "an atheist Greeting card comany?" or bought a book on car maintenance because it came from a religious publishing company as opposed to a book on car maintenance published by someone else? It's as if they think because if has a particular religions stamp of approval on it, ...the instructions for doing oil changes will be more complete, more holy, and more sanctified by their god, ...or that their oil will stay purer longer. What do they think the other maintenance manual might include... illicit subliminal unholy messages? ...Or is that they're concerned that the manual does not instruct them to say a prayer for every ounce of oil they pour into the motor?

I sometimes wonder how some of these same people would respond if they were sent a greeting card with verses from the Quran... or with printed philosophy that came from a religion completely different from their own.