Why are antis so stridant and unreasonable?

They have literally no argument. Logically communism just works. When you lay the facts out, however, antis will get riled up and threaten you while babbling about historical strawmen. To hear an anti tell it, communism leads to immediate mass death, like it's a plague rather than the most logical way to organize a society. Does anybody know why they get like this? Is it just the result of a low-IQ or is something more sinister going on?

btw did israel have a mass immigration/exmigration?
last time i checked it was 50% jewish population, but it's up at 75% now

the risk/reward of the pretending of being jewish got a bit expensive