Earlier quoted context omitted.
Time magazine: http://time.com/4680885/nato-defense-spending-budget-trump/ Economist: http://www.economist.com/blogs/graphicdetail/2017/02/daily-c... WSJ: https://www.wsj.com/articles/nato-calls-for-rise-in-defence-... All disagree with you, but of course you must know better sources and just did not add them. I'm sure.
From your own source: "At a summit in 2014, NATO reiterated its commitment to the 2% target. Members that fell short at the time promised to meet their obligations by 2024." But, again, even in the worst light possible, a country not spending enough on military spending to meet some stated target doesn't compare to tossing out treaties based on a whim.
The tradition of significant international agreements made deliberately short of "treaties" goes back to FDR/Churchill and the Atlantic Charter, if not further.