I don't think you're necessarily wrong, and I'm certainly no expert. However, I do know that Ukraine has long struggled with corruption, and has been making slow progress over the past couple of decades. And they will always have (there are always, in any conflict) a certain level of partisanship in their own ranks.

I've been mildly concerned about what could happen after the invasion; assuming Ukraine is successful, Zelenskyy's popularity could make it easy for him to transition into a dictatorship. However, so far I've seen little to indicate that he's anything other than a sincere, effective, and passionate leader -- I like the guy, and I'm inclined to trust his judgement. He's done unexpectedly well so far, and Ukraine under his leadership has been acting up to the highest ethical ideals of the EU.

Maybe Ukraine leadership is making a mistake, but maybe they know something us armchair Generals don't.