The reasonable countries in NATO have been burnt before by letting in countries with a long record of having reasonable governments, and Ukraine has had one for only a decade. They probably aren't that keen to be burnt again.
Yet NATO has not taken any steps to remove/ suspend the memberships of member countries turned dictatorships or with govt. supporting dictatorships. They're ok with it, so why this farce?
Meanwhile while NATO has a lot to offer Ukraine, Ukraine doesn't have a whole lot to offer NATO
Ukraine is a buffer country between Russia and NATO countries. It controls a critical piece of territory & has been offering NATO a whole lot since Feb 24, 2022 which is why NATO is supplying them arms & ammo. NATO is not altruistic, Hell! it was only when Ukraine did not lose in the planned 3-4 days and when NATO's own citizens held huge demonstrations supporting Ukraine that it started supporting Ukraine.
NATO is content with Ukraine bleeding and getting bombed, because Putin (who they all have coddled for a long while) is kept busy with it, is weakened by it, but still retains power in Russia. A decisive win for Ukraine is a fatal loss for Putin and NATO are afraid of what he might do. They've always been afraid of him, so they sacrifice Ukraine. It is most cowardly.