It’s very true that plain old corruption and the need of politicians to protect and defend their income stream probably has a lot to do with our electoral problems. And this is regardless of ideology or party.
However, I think we are definitely seeing a triumph of leftist ideology, because it essentially creates a system where government is overtly nothing but a funnel for corruption, making sure the perks go to those most in favor of fortifying government and keeping the money coming. Communist governments have always been fabulously corrupt, and their leaders always die wealthy and with their families having soared into the mega-rich category.
no ideology is “triumphant” that requires 8 foot fences topped with concertina wire between those who have assumed “ruler ship” over the governed.