Why are alt-right politicians becoming more and more popular?

For sure some people just don't like actions of left side politicians who were in charge for many years now and maybe the results weren't satisfying for some people, who blame them for their misery. Alt-right politicians promise what people want to get promised and thus manipulate them. That's why societies voting for them don't see any bad effects of what they are planning to do and they are somehow blind to reality. Also in countries like Brazil which is going through big crisis and it's going to collapse people think that politicians who were in charge during this crisis can't help anymore. They are desperately trying to change anything and they believe that voting on alt-right politicians is the only option to achieve that.