Lack of politics benefitting, and this is a broad term, left-behind people, be that economically or socially. The whole republic had a severe right shift after reunification with people calling themselves socdems introducing a whole new low-wage sector and that’s just the tip of the iceberg, together with the east never getting properly integrated, politically speaking, and having their economy forcibly dismantled by western competition (no those weren’t just market forces) that’s a triple whammy for them.

Voters aren’t necessarily actually ideologically aligned – they’re just out of options when it comes to protesting, and, well, they’re largely easterners they somehow don’t even consider founding whatever party they actually want to see. That is, for example, the average easterner is anti-immigration, but not anti-immigrant: They have zero beef with that black lesbian running a Kebab shop, heck in their village she might be the only one holding up the flag on a Sunday, it’s a “let no more in until we’re being taken cared of” kind of attitude. The political class by and large, both left and right, completely fail to see the distinction to xenophobia proper, there, deepening the – correct – impression that noone actually cares. That breeds a rebellious attitude, “vote where it hurts the establishment”.