So your example of left wing extremism is an unidentified black lives matter member that assassinated a black youth for joyriding, based on assumptions.

It's not exactly the most compelling example of a political motivated assassination, is it. Given I can pull out literally dozens of people killed by right wing extremists with overwhelming evidence and convicted in a court of law.

I'm a centrist, and I'm not even American. Your argument holds less weight than a wet paper bag.