The only time NATO intervened militarly at the request of a member (through Article 5) in its history was actually for the benefit of the US.

Export sales of the F-35 are likely to decline sharply if NATO is ended.

NATO was founded by the US to create peace in the world. Some part of its ~$160tn wealth is probably down to that.

They went to support them for war in Afghanistan and Iraq.

They spend many billions per year buying US weapons, not so much anymore though thanks to Trump.