Why do some Americans want to leave NATO?

Honest question. Just hoping to understand / know the reasons that people have.

I'm personally from Finland, we just joined NATO. I definitely understand the criticism towards countries that do not fulfill the 2% spending rule. The countries that border Russia in Europe generally all meet the 2% rule, but the same can't unfortunately be said for central / western european countries.

I'm proud that Finland has always been keeping up its defense budget + also has nationwide conscription. We also have the largest tank army in all of Europe currently (population 5M). On one hand it's great, but on the other hand it shows that there is a problem in Europe when a country with a population of 5M has more tanks / generally a stronger army than Germany, population 80M.