Of the choices the Democrats are most likely to stop the concentration camps so of my three options (vote Dem, vote Repub, do nothing and/or vote third party) I'll do the one that is most likely to effect the change I want

Let's look at a historical analogue. In the past Democrats were anti-gay marriage. I think Clinton only came around on it in like 2012 and Obama in like 2008 or something like that, who knows. But recently in the grand scheme of things. Can you imagine in like 2006 being like "well the Democrats and Republicans both don't support the gay community so I guess I'll just not vote"? But the Dems were the most likely to eventually come around, and enough people pushed them in that direction that they did the right thing. That's how politics works