NATO served to blunt the expansion of the Soviet Union and today serves to protect Western Europe. I.e., alliances are as old as nations and tribes. If I lived in any Western European nation I would sleep better under a NATO alliance. The Ukraine Russia war may have been averted with a Ukraine in NATO.
It’s pretty good at destroying Libya and wasting my tax dollars but Europeans are adults. They can take care of themselves
Protect Western Europe from whom (NATO having watched the Soviet Union collapse under its own weight)?
Someone else here already made the reference to the financial size of NATO commitments. If Russia was no longer a threat to Western Europe, there was certainly enough money at stake to make her one.