I think conservatives, above all, have a moral obligation to do all in their power to defeat Trump since it is they and they alone–the Party of Personal Responsibility and the Right Wing Noise Machine–who bred and catechized the base of morons, racists, and misogynists who made him a power in the lend. Sitting this out is just the final act of nihilist irresponsibility by the party that bears 100% of the weight of responsibility for paving the way for this guy.