Earlier quoted context omitted.
Voters cannot be held accountable for all the specific things the person they elected do. That much should be self-evident.
If they could have known or suspected those things, then yes, they bear the responsibility. And Trump's intentions were there for all to see.
In a situation like this, I like to do a thought experiment where I replace "Trump" with "Republican voter" in a headline or a story to see whether that idea holds up.