To begin with, I'll be fair and state that I am quite a peacenick myself, and by looks I appear a bit of a hippy. I'm white, but have natural dreadlocks, even if I wear normal clothes that's enough for some people to dislike me on site. Really though, that just works as an idiot-who-assumes-things deflector. And it is a mere assumption to say that since I am anti-war, I don't like war video games. I myself play Counter Strike and many other games in which you kill and worse.
I think that these people have the right to protest. If they're not playing a game properly, then I simply applaud them for doing what is within the rules to do. If you really want to implement a program that doesn't allow players to form their characters into a heart shape, then something's a bit wrong here.
Let them do whatever they like. This is the same as saying AFKers don't have the right to be AFK, even if it gets you a free kill. It's retarded to complain about this, really. They have freedom of play style, just the same as the world should have freedom of speech. Even if their play style means not trying to win at all, it is up to them how badly they play their game.
And while it's true that games teach us some level of what's real about the battlefield, like high death rates, that's not really an argument against political action in a game. These people are protesting the wars in real life, not the wars in video games. They're protesting unrealistic portions of violence in gaming, which is something plenty of fans do on Internet forums anyway.
I say, if that's what the people want to talk about, then bring it on. Because it's not actually something people can or will control on public servers.