In Europe and in North America, the people seeking to overturn Western Civilization think that violence is their only option, since they know they cannot win the war of ideas.
But do note that traditional, patriotic Americans have not used violence as a means of political expression. The Democrats in the South sure used a lot of violence to enforce Jim Crow, but Democrats fall under the "Anarchists and Leftists" umbrella. The people who respect the Constitution don't act that way.
We haven't changed.
They haven't changed.
But they have become more desperate as they have passed the apex of their political power.