It's more to do with people's trust in the government than Trump being elected. As an example - Trump's lies about the size of the crowd at inauguration.
How about trusting Obama when voting for him and then seeing him suing whistleblowers like never before, and continuing the never-ending trail of War in the Middle-East (without ANY Congress approval) despite getting a Nobel peace prize (let's not forget his personal "kill-list" for drone strikes too) ? And while he was supposed to be progressive about drug use, he has intensified the War on Drugs in practice to a level that even Bush did not even dream to go to. So, can we be honest a second about "trust in elected officials" ?