Yes this is always going to happen. IMO AIBU is and should remain a bit of a free-for-all.
Fine if you are in the mood for a pile on or want to get into it on a parking thread, but not a good way to promote informed discussion about a serious subject.
AIBU will always promote the most click-baity threads while other topics drift off the front pages. If all the dog topics were on AIBU it would be easy to find a post on ‘AIBU to think dogs should never be off lead’ and difficult to see a 2 day old post on ‘are labradors prone to arthritis’?
There is a separate discussion about whether threads should be moved. The two arguments for having this policy on Ukraine are
1). The nature of the site is that many people will be posting here and seeking advice because they are going through something traumatic. If they want to filter out information on Ukraine while discussing this, why on Earth not?
People who don’t understand this fundamentally misunderstand the nature of the site. It is not Reddit.
2). Many of the threads on Ukraine are ill informed, repetitive and border line trolling.