You're as wrong as chrys was when he preached that line for years.
Well, they are right. We have a two-party system, not by law, but by electoral design. You can vote for one of two options, or you can vote a protest, but the protest doesn't help anyone get into office, and if you were the sort of voter who supported one party consistently before, then you are inadvertently helping the other side.
Or, here's how anyone interested goes you one better: it's the Republican party that is electing Hillary by offering as its candidate a man many conservatives simply can't vote for in good conscience. So by not forwarding a viable, conservative candidate (using your logic) they are de facto nominating Hillary for president.
lain:
That's not wrong either though. Surely the vast majority of the people who voted for Rump in the primary didn't intend it, but that's the practical outcome regardless, if it is true that he's unelectable in the general. What's really happening, I think, is that the GOP is transitioning from a viable major party to a fractional white-nationalist minor party focused on preserving white privileges in a diversifying nation. As that happens, the base becomes more and more determined to nominate candidates that can't win in a general election, and unless they jettison part of that base and reinvent the party, they will continue to slide toward oblivion. The problem is, they need that base to win elections. Unless something changes, Chrys is the GOP's past, and CC is its future.
