It doesn’t take a lot of effort to learn to use one, and the right would initially produce an unorganized mess of over-confident green “soldiers” with no objective, supply chain, stable political support or coordination.
It would be an awful mess for at least 2 years, and then by the time that chaos is sorted out, the left would have caught up in many ways.
Then it will really be a shi* show.
But it does take effort and time to train someone to the point they are able to kill another person without feeling.
Perfect. Impossible to stop because there is no 'head' to cut off.
This is exactly the sort of force that would turn cities into death traps.