What solid proof is there that a Hillary Presidency would not be as disastrous as it is believed that a Trump Presidency be?

Online, in the coffee shop, on the street etc. it seems like some (those who did not vote for Trump) believe it will be a disaster or worse that Trump got elected. I wonder how those who believe that know beyond doubt, or have something concrete that a Clinton Presidency would not be worse than or equally as bad as a Trump Presidency? Are they merely going off personal belief that Hillary would be better because they like her but have nothing so concrete they would bet their vehicle are house on? Are those Hillary fans so clairvoyant they can see what no one else can see about the performance of a President in the future?