If muslims are so sick of being seen negatively, why wont they do something about it?

ive heard muslims over and over say that theyre tired people spreading lies about them and misunderstanding their religion, but what r we misunderstanding or lying about? 1st they state theyre peaceful, but then we see their leaders proclaim war, muslims supporting it and muslims executing the attacks. am i ,missing something? i turn on my tv and theres guy saying he's muslim, he kills a bunch of people, then another muslim pops up saying the 1st guy was a holy soldier or something and then i see the leaders of muslim countries praising the murders of these "non-muslims". if something like this would happen in any other kind of group anywhere, that particular group would put a stop to it themselves. but not muslims. they seem to prefer to get mad at the victims' families for stating the obvious: "they claimed to be peaceful, but then started killing every1". every other group of people in the world would put a stop to it, but not muslims. i dont get it. r they the 1s who r actually misinformed? is it some kind cultural thing where its ok to lie, kill, get pissed off at every1 whos not cool with it and then accuse them of intolorance? or is it a strange combination of fear and anger? that last 1 is the only 1 that makes any sense to me. maybe most of them disagree with the killings, but r too afraid (or selfish) to put a stop to it. and anger towards the victims is a convenient way to vent and show submission to the extremists. if your muslim, dont hate me if im misunderstanding something. im trying to understand u the best i can by trying to make sense of your ACTIONS. i dont care about doctrines or empty words. to me personally, actions speak louder than words. if im wrong, then please explain y u havent done anything about it for over 1,500 years. if u arent muslim plz let me know your observations and your views.