"Trump said that Rafael Cruz "was with Lee Harvey Oswald" before the assassination of President John F. Kennedy.

The sole "evidence" for this claim is a grainy photograph that shows Oswald with a man who may bear a resemblance to Cruz. But experts tell PolitiFact that the image is too degraded to offer much confidence. At the same time, multiple experts about the world of early 1960s pro-Castro advocacy said they have never seen evidence of Cruz associating with Oswald and consider Trump’s claim implausible at best and ridiculous at worst."

But that's enough information to convict him in the eyes of many. I don't understand why that tactic works with so many. Do many people have a predisposition to think the worse? Or is the safe answer is that there is a very slight chance he is guilty and better safe then sorry.