Unless a nation is actively at war with us, they're not an "enemy". They may be competitors for resources, but not an enemy. They may be total a**w**** while they're at it, but not enemies.
I believe that bringing Russia into NATO could turn out to be a good thing. After all, have we forgotten "The Yellow Peril"? Right now it's China and Russia against America. Not America and allies, just America, by ourselves.
The cold-war is long over. Russia lost and was broken up and reduced to a shell of the former CCCP. They still have ambitions around the world, but so do we. They have evil leaders from time to time, but so do we.
For every evil that the current Russia could possibly do, we have ten times the counter for it.
The old guard doesn't want to lose their place on the world stage. They keep dragging America back into the cold-war, using old propaganda themes, and our own natural tendency to be xenophobic, as a way to continue in power.