Just the usual right- wing propaganda and conspiracy theories brain-washing people.
Some only vote against their own interests (like all the AfD fans believing those are the ones protecting them from the government plans to drown them in foreigners), some hurt themselves (like when they rebel against the evil government's plan to kill them all off with vaccines to make room for easier to control people), some attack minorities (that are totally trying to take over their country... any moment now), and some -like this especially moronic guy- feel the need to punish German citizens (because they elected that government that is totally trying to islamize Europe by importing radical muslim refugees).
All fell victim to basically the same right-wing fairy tale: the great replacement...also an anti-semite classic.