Yes, Trump is dangerous. He already attacked NATO in his first term.
And he doesn't understand the differences between the US and its warring and the money spent on this warring, and other countries who don't go warring.
The US spends HUGE AMOUNTS of money on the healthcare of troops because they got injured in Iraq, Afghanistan or other places. Germany and many other NATO countries don't have this. So clearly their military spending will be different. But the US spending money on people's healthcare doesn't help NATO one little bit.