The problem is, and this happened with the covid board, is it encourages thread police. The thread is the derailed with posts of "why did you post this here, there is a war board".
Also not all posts concerning Ukraine are deserving of being in a "war" board so there will be just as many threads popping up. Read one last night that was all about ways to support the people of Ukraine - the best charities to donate to for example. Others will be about gas prices rising which will undoubtedly discuss the conflict. Discussing sanctions being placed on Russia and the possibility of sanctions against Russian individuals.
It's topical, rightly so. It should be allowed to be discussed in any board the thread creator wants to create the post.
Will there be posts scaremongering and/or people who are thinking worst case scenario? Yes. But much better they are in the most popular areas so any scaremongering can be called out and people can get some reassurance.
It's all very well saying threads would still be in most active, but in my experience (covid boards) they do get lost a bit. That's why people post in aibu- for traffic.
Why have we, as adults lost the ability to scroll past a thread that doesn't interest us or we don't want to read?