"Why is the political party that actively wants to destroy our institutions ok with destroying our institutions?"
That's your question, reframed.
If you want a real answer, it's because Roe v. Wade "was" settled law & the Democrats are a "big tent" party with a lot of disparate views that always don't mesh together. They should be 3 parties working as a collation, but our stupid FPtP election system won't allow that.
Following that, note which party has made RCV illegal in 5 states.