You can trust "them", I would rather not though.
Actually, you'll pretty much have to. If they wanted to screw you over they could quite easily. All they need to do is break the law and vote for whoever they want and then get pardoned.
Electors have voted differently than the popular vote, not because Hitler was running for office either. It's fine having electors, in my opinion, as long as they reflect the state's popular vote.
Once they did, in 1836. Hasn't happened in 170 years, and it has never changed the outcome of an election.