So by that “logic”, any Trump supporter who refuses to vote for the GOP nominee, even if they think the nomination was “stolen”, is also a Hillary supporter...
If Trump is robbed of the nomination, and Trump supporters refuse to vote for the GOP candidate, and if there is no viable 3rd party with a path to victory, then, yes, refusing to vote for the GOP candidate would be tantamount to giving support to Hillary, directly or indirectly. Just as you are doing right now.