re: Why are some conservatives here against Pence?

I don't think conservatives are against Pence. It's just that the country, through the established method of electing a president (the electoral college), overwhelmingly voted to elect Donald J. Trump as president, for better or worse. And to remove him from office by partisan politics or via the 25th amendment would be to disenfranchise 62.9 million Americans. Now if some significant health problems arise or something truly significant comes from the Russian investigation that's a different story.

But as of right now? hell no. Nothing concrete from the Russian Investigation has been tied to Trump and the mentally unfit angle the left is trying for would have applied to 18 prior presidents before Trump, so that's not legitimate either.