Then support the others. A protest vote and a vote of conscience is fine. But just accept the fact that such helps Hillary. If she wins in a squeaker, be prepared for her presidency.
That's why Right-thinking Americans should begin to leave the GOP in droves. Those who support the Constitution, our sovereignty, our borders, limited federal control over our lives, etc. are not welcome in the GOP. The GOP Establishment is doing everything it can to refute the principles it used to believe in.