I think what is missing from mutant history in the MU is the legal victories.
Let's have a mutant who is attacked for no reason but being a mutant by a group of humans. He uses lethal force to defend himself. And is put on trial. Texas self defense law (and other places) has this thing called disparity of force. Basically saying that if you are faced with multiple attackers who do not have weapons you cannot be reasonably expected to defend yourself with just your hands. Under the law the mutant is legally justified to use lethal force. Wins the case and sets legal precedent.
Another case could be a mutant attacked by the government by mistake. The FBI is tracking mutant bank robbers and catches up with them and uses Sentinels to apprehend them. However the Sentinels scan this other mutant a few blocks away and attacks him. Mutant destroys Sentinels and maybe seriously harms human agents....but is proven legally justified during the investigation and brings a civil rights lawsuit against the government and wins.