Nice try to frame Merkel as equally responsible for the rift.  She isn't (and, incidentally, she's famous for her measured, even way of making decisions and presenting ideas).  And the serious part isn't about the Paris Agreement.  It's about Trump's pointed omission of reaffirming NATO's Article 5, which requires all members to treat an attack on one as an attack on all.  America was the architect of NATO, and the only time Article 5 was invoked was after the 9/11 attacks on America.  That's why British, German, Dutch, and other contingents joined our attack on, and occupation of, Afghanistan.  There was considerable hope (and anxiety), well-publicized before Trump's address to NATO, that he would simply reaffirm that the United States still stands behind Article 5.  His deliberate failure to do so cast grave doubt over how much the European members could rely on American backing.  That failure, along with trash-talking other members, is what will destroy NATO.  The Russians rejoice.