Sure, we can blame politicians which were mostly bad to worse and stole everything that was previously state-owned (meaning everything). But folks kept voting for them in similar fashion you describe so this is the result, its trivial to 'buy' votes with relatively low budget. I mean current PM has very tight and visible connections to Italian 'Ndrangheta mafia, he or people around him did a contract murder of reporter looking into that. He didn't ever faced jail and is back being PM like there is no tomorrow. There is only so much blame one can point outwards, you can't be dumb / do dumb shit and expect long term marvels of prosperity on Switzerland's level.
Lived in both of those countries, and they look exactly as they should given overall population efforts towards hard work, honesty, rule of law and so on. If US would be a nation of slackers and thieves it would also look very differently to how it is.
Those countries who were fresh from behind the iron curtain were really dealt a bad hand. They had lived in a "protective bubble", albeit a very unsustainable one and suddenly were thrown in the ocean surrounded by sharks looking for an easy meal. Almost every one of those people found themselves desperate but "inexperienced" and unprepared for the new world, every politician was absolutely blown away by the fortune they could make, and every other country jumped on the opportunity to make money. Like shooting fish in a barrel.
For every politician who took a bribe, someone who already had money paid it. That money didn't come from inside those poor countries. This leveraging of poorer countries never stopped. That's how some countries get a better deal than others when the EU adopted the Euro, for example. But it's never been so bad as back then because it's incredibly rare that entire countries find themselves exiting a time capsule, just ready to be exploited by people who already know how the game is played.
This reminds me of two things. The people who always think others are poor because they're lazy, and the people with perfect hindsight and no pressure judging that Captain Sully could have landed the plane back on the runway instead of the Hudson.
A lot of people in the US feel the same way right now.