I wouldn't call them "left stances" per se, as it's something the right also tends to do. Especially when comparing it to the current administration, which despite expecting it to be bad, I certainly didn't expect it to be this unprecedentally bad.

What I mean, mostly, is that if "you" want people to stand by you showing why the other side sucks isn't nearly enough. The people already know the other side sucks - they want something better, not more of the same but with a different coat of paint. Unless you can convince the people you are better than the other options, badmouthing the opposition won't do much to people who've seen this play out a thousand times before.

Why was Trump elected? (and note, I'm not entirely convinced he actually was, but that's another whole discussion) Biden wasn't doing anything nearly as outlandish as this administration is doing, but they were still concealing Biden's mental state when it was obvious to most. Harris made sure to make her campaign pure spectacle and fanfare through celebrities and huge amounts of spending, focusing way more on appearance than on substance, while the people craved better living conditions overall. And regardless of the obvious answer, what did Trump run his campaign on? Precisely what the people were desperate to hear, even if they knew coming from him it might be bs (which everyone sees it actually was all along).

This is not just a political issue, but a cultural one as well. People don't vote for policies, they vote for colors, for their preferred celebrities, and for whoever can throw the flashiest party - and on that regard allow me a bit of hippocrisy, as in my country it's not that different, even if we do have more parties to choose from (I.e., what I'm saying isn't valid just for the US, but for many more so-called democratic nations, which irks me to the bone). In practical terms there isn't even any other option available because people won't even consider them. And on that department as long as mentalities don't change, neither will the system. And after years of this tug war by both sides pulling to themselves while badmouthing the other, one of them decided it was time to solve this impasse once and for all, by any means necessary.

The current administration, even if Trump kicks the bucket midway, is clearly not planning to leave unless forced through sweat and blood. Otherwise they wouldn't go to so much trouble and not care about their unpopularity when someone else can just come later and undo everything they did. Of course the problem runs deeper than this already long text, but if discussed at lenght this would make a book.