Well, because I'm on Ukraine's side in this conflict and I want Russia to lose the war. The idea of straight up refusing Russian people at the border doesn't sit right with me, but I can understand why they shouldn't be just let through no questions asked (the arguments I heard and listed in my previous comment). And we as "the West" need to put as much strain on Putin's regime as we can -- some of that strain, unfortunetely, will impact regular Russians.

Also, there is a clear difference between Ukrainian refugees, fleeing bombings and attacks on civilian infrastructure in their hometowns, and Russian dudes that are trying to avoid the mobilization. Draft evasion is considered a criminal offense in most countries, not just totalitarian hellholes. You wouldn't treat a burglar escaping their national law enforcement to a different country as a refugee, would you?