Ukraine shouldn’t ally with NATO because NATO shouldn’t exist.
Maidan wasn’t about NATO. Support for NATO membership of Ukraine only sky-rocketed once Russia invaded (after 2014, that is), and by now is overwhelming.
Maidan was about EU membership. Should the EU also not exist in your mind? And yes btw the EU is also a defensive alliance (it’s a gazillion of things). Russia’s invasion wouldn’t have happened had Ukraine been a member. Hence why Russia’s stooge Yanukovich was ordered to stop EU accession: Because then Russia wouldn’t be able to invade, any more. Ukraine would be as safe as the Baltics and Finland have been all this time.
Oh and btw after the 2004 NATO enlargement (including the Baltics) Putin said that he saw no threat to Russia from that, and also that every country was free to choose their alliance.