As long as you're willing to accept the consequences of it that's fine. But yeah WWIII isn't gonna happen.
I figure Trump will act more presidential if he wins the GOP nomination, and a lot more presidential if he wins the presidency. My plans are to vote for Sanders in the primary, then vote for him in November if he makes it that far, by some miracle. If it comes down to Hillary vs. Trump, I will either stay home or vote for Trump, depending on how he acts between now and November.