When a society makes a race of people feel like subordinates and has repeatedly shown its willingness to harm or kill them for little or no cause so often that it's best described as "too fucking often," you can't be surprised when some members of that group become angry, maybe even militant. Some overcome the ensuing rage and try to find a peaceful solution. But anger is a difficult emotion to bottle, especially when it's centered around something as stupid as fearing for your life because of what you look like.
Let's put that maddening feeling into stupidly common terms we can all understand: Have you ever been driven crazy because someone didn't understand a very basic idea you were trying to explain? Like you were trying to explain to your technophobic parents how to use the remote control to the 75-inch smart TV they bought for no reason? No matter how you phrase it, they just don't get that if they want to watch Netflix all they've got to do is push the gigantic red button with the Netflix logo right in the middle of the remote.
"It's the big red one, ma! NO! NOT THE LITTLE RED 'A'! DAMMIT, MA!"
The frustration of that builds with every passing second in which your well-meaning parents don't understand that all they've got to do is hit one clearly marked button. One button, that's it! It's right there, dad. Mom, please, the button isn't in another room. Good Lord. Why would you even think that?