We literally still have Russian nuclear weapons pointed at us. That seems like a serious threat.

Containment as a policy worked well enough during the Cold War as the least bad alternative. There's no reason to stop it and allow Russia to reconquer Eastern Europe, which they absolutely would do absent a strong containment policy. The historical record shows that isolationism and appeasement never works in the long run.

The Ukrainians are still willing to fight for their own soil so your point is illogical and irrelevant. They're just asking for weapons, logistics, and intelligence. The more Russian soldiers that they can kill, the less threat that Russia will pose in other areas. It's sad the situation has come to this point and I take no delight in those deaths but there is no realistic alternative.