America is really now two Americas. The divide between traditional freedoms and neo-authoritarianism is getting wider. But America is so large that even the minority (just) that believes in freedom is still 167 million people. Even if only a small percentage of that number, from either side of the divide, believes in violent activism, things are going to get worse before they get better.
It just depends on if you're on the up portion of the K or the down stick. The larger picture might show an increase but if you split the data apart one leg is actually declining while the other is growing.