I don't think that people with any grasp of Greek politics have forgotten or forgiven Tsipras for any of the 5 you mention. People that have no clue maybe. But it is easier to call someone a traitor, for betraying the trust he was given, than mention all these things again and again.
Now if indeed it is racism and nationalism and a "Greeks only" mentality that drove some voters. Which is likely, then it is but an echo of a greater issue with liberal democracy in general. Not a Greek issue. You see it in Europe, the US. But Greece can't really fix this. It's just not an important enough player for that. Competent politicians could at best alleviate its effects. In the EU, it's on the shoulders of the greater powers, particularly Germany, who under Merkel has proven to be woefully inadequate and shortsighted. If nothing happens, then Putin will have the last laugh and liberal democracy will perish. Frankly, even I find it increasingly difficult to defend. In light of what's been happening.
All that said. I agree that ND is
. And Greek voters (in general) are morons who don't know how to use, or worse sometimes outright abuse, the privilege they've been given.