Why are we allowing left wing terrorism to win?

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As many have noticed, left wing extremists have been getting more violent and destructive over the past year, especially since Trump's victory in the election last November. During his inauguration, 217 of these violent thugs were arrested in DC. Since then there have been countless videos of violent leftists attacking businesses, and people that they believe are Trump supporters. More recently, left wing terrorists have gotten exceptionally violent at college campuses. Attacking bystanders, destroying property, and setting fires. College campuses have encouraged this by allowing it, and ordering police to stand aside, making no arrests. It has now reached the point where all these terrorists have to do is threaten violence, and colleges like Berkeley will simply cancel the speaker who offends these terrorists. In Portland, they've taken it a step further, refusing the basic first amendment rights of republicans who want to march because left wing terrorists have promised violence. Rather than confront these terrorists, the city of Portland has caved to their demands, just as UC Berkeley and other colleges have. When does it stop? When do we actually prosecute the terrorists instead of taking away the rights of innocent people? Will democrats actually stand up for the rights of republicans, or side with the terrorists who share their ideology?