Nearly the entire Obama presidency has been an exercise in figuring out ways to work around checks and balances. Unilaterally changing the status of millions of illegal immigrants because you can’t achieve your political goals may strike you as morally sound, but it oversteps any conception of executive power found in the Constitution. [Democrats] aren’t nervous about authoritarianism, they’re worried about how Trump would use it.
If you support a candidate like Hillary, who pushed the administration to get involved in the Libyan war without congressional approval, you’ll have little moral standing to be upset when Trump bombs people to “take their oil.” If you believe Obama has the right to assassinate suspected terrorists abroad without a trial, you have less authority to be upset when Trump threatens those associated with terrorists.
Democrats would be a lot more believable on Trump’s rise if they hadn’t succumbed to the cult of personality in 2008, which was no less creepy. The attacks on dissent, the chilling of speech (remember the White House’s efforts to collect “fishy” comments from dissenters; one could easily imagine Trump setting up the same thing of system), and the accusation of unpatriotic behavior were all unhealthy for a free society. Yes, Americans are increasingly willing to accept extraconstitutional government if it accomplishes the things they desire. That includes Democrats.