> I cannot find any other explanation for this behaviour than stupidity.

I can find one other explanation: greed.

For a demonstration of Kolmogorov complexity, it's good to watch "A mind is born"[0] by lftkryo. It's only 256 bytes, but can generate over 2 minutes of complex music and video. Also, the name is appropriate for this topic :D

[0] https://www.youtube.com/watch?v=sWblpsLZ-O8

It already disappeared from front page. Your comment was 45 minutes old when I was writing this.

No one likes to be the bad messenger saying to Americans that they were fooled and all that hatred against their opponents (opposite party) was actually induced, not born out of their own superiority.