The point is, I simply don’t believe when Trump says he is actually going to deport all illegals, given his previous statements on the issue. And, without that issue, I see no reason to support him.
But if you trust the guy, then go right ahead.
Who cares that you don't believe Trump to do something you know your candidate won't do at all? It's a stupid and infantile reason to doom the country. "I don't believe your candidate really will save the country from permanent Democratic control! So I'm going to choose the candidate who guarantees it!"