Don’t sell the leftists short - They may seem like wimps but they have absolutely no scruples when it comes to their beliefs.
Look at the millions killed by the Leninists, the Stalinists, the Maoists, the Khmer Rouge, Castro, etc.
They are ruthless and when it’s time for them to get arms they will.
Compare our polite Tea Party protests to the riots by the BLMs, the Berkeley SJWs etc. They are much more energized by and committed to their beliefs than we are to ours.
The leaders of the Communist mass murders were from the middle class of their countries and were for the most part college trained elitists. However, the ones who did the hard work of fighting the counter-revolutionaries and foreign armies were men of sturdy peasant and worker background. Potentially ruthless leaders are out there: I have no doubt that someone like Bill Ayers would replicate the role of Lenin or Trotsky if possible. The Left's main deficiency is the lack of an effective army. The closest thing they have to this sort are the gangbangers of the ethnic ghettoes. However, these are not disciplined men who grew up plowing fields, digging ditches, etc., like the average foot soldier in the Red Army or the Cheka. If they are in shape, it came from playing sports, not manual labor. Many of these people are mentally challenged due to narcotics addiction, and are unreliable in following orders. They usually don't succeed in the Armed Forces unless they make a determined decision to break away from the ghetto lifestyle.
Basically, the Left lacks the sort of men needed to fight Middle American resistance and impose a dictatorship.