The thing is, with every vote being relatively close to 50-50, a minority acting in bad faith can make a lot of damage.
Also "I don't understand all of that" is a weak reply. If you don't understand, there is the option to not vote. I don't mean to disrespect your father, I make no claim to perfection myself, and I certainly don't understand 100% of every issue at stake in every election. But the way immigrants are treated is a pretty big thing, and the authoritarian tendency is one that was warned about well ahead of the election.
Ultimately I don't have all the context with your father. But the person I have been talking about made public claims that this was clearly a good thing for society, that he knew better despite the woke propaganda, basically acted superior. I reject the notion that this person was deceived.