The culture of Leftism is far too deeply embedded to fix.
Commies have been exclusively hiring and promoting commies for decades now.
Brennan voted for a Stalinist in 1976, when the Soviet Gulags were full, admitted it on his CIA intake polygraph, and he rose to become director of the CIA.
And it’s only gotten “progressively” worse since then.
I agree, depending on what is meant by the word 'fix'. There are no 'simple' focused solutions, and getting rid of this infestation will require a lot of effort and time. One of the first things we need to do is exactly what Trump is doing - speaking clearly and challenging the thoughts/philosophy/ideology/sacred cows of the left directly and definitively. The shallowness, lack of intellectual underpinning, and destructiveness of the left's positions must be pointed out again, and again, and again in every public forum possible.