Many are saying that this is the Left reaping what it has sown for so many decades. I agree with that and will add this.
My understanding is that it was the PLO that sort of 'instituted' and internationalized the practice of blowing up masses of civilians in common public areas such as malls, buses, etc. Before the PLO, this now common type of terrorism was unheard of, or at the least very rare.
The initial intent of these barbaric attacks was to fight Israel and the infidels by putting them on edge and to demoralize them.
These PLO atrocities received widespread praise from almost all Muslim nations.
I said at the time that the Muslims were opening the door to hell on their own heads. I knew immediately, prescient as I am, that it would only take time until they start doing this to each other once they are taught how. I could not have been more right. Today, Muslims conduct these same kind of attacks on other Muslims almost on a daily basis.
This has a direct correlation to what is happening to the Left today. Once you train people how to be a bully, using the Alinsky model, to usher in the tyranny of the minority, then there is nothing to stop them from using it against their teachers once they know how to do it.
When you unleash any kind of 'no rules' tactic for short term gains, your shortsightedness will come back to haunt you when the tactics are turned on you.
This is exactly why most leaders In history have at least attempted to behave within rules and with dignity and respect. They were thinking in longer terms than a 'win at any cost' short term gain.
The Left and the Muslims have no rules and no honor. We are seeing the results of that kind of thinking in both groups today.