I'm not saying it's impossible that trump could be offensive enough to cause an attack on the US which then results in offensive US action - but I've seen nothing to indicate he'll go looking to do so as a matter of policy.
Hyperbole is everywhere at the moment and whilst it makes for pithy comment it detracts from realistic concerns about the outcomes of his policy decisions. By giving people easy excuses to ignore "anti trump" comments (because they're a mixture of valid concerns and silliness) you grant him more freedom.
He is probably less likely to actively pursue conflict with Russia than his alternative, and he's reaffirmed support for NATO (which was no doubt part of the package traded for a non critical stance by the UK PM).