Being President comes with pitfalls and one of those are putting citizens and children, mothers, fathers, in harms way. Trump inherited several conflicts where the United States could potentially become in direct conflict with another world power such as China or Russia and while many are confident that the United States would or could prevail I don't know that finding out is potentially worth it.
Venezuela potentially the next powder keg where Russia faces off with America. Trump has said that using American Troops to help depose the current leader of Venezuela and install a more favorable political leader. The problem is that the current President/leader is inviting Russian troops into his Nation to assist him in maintaining power. In this case I think too often leader's egos can get in the way of diplomacy and both Putin and Trump have colossal egos. When that happens it can easily and quickly become dangerous for everyone given what's at stake. I don't think any Americans are ready for another potential Cuban missile crisis with either Russia, Cuba, or China.