My point is that this is a bullshit quote that people use to shore up their opinion without actually having to think.

If it didn't sound apocryphal to you, would it really change the fact that Hanlon's/Heinlein's razor is nothing more than a non-scientific personal philosophical statement?

In any case look at Wikipedia - other smart people are quoted saying the same thing that was attributed to Einstein:

"...misunderstandings and neglect create more confusion in this world than trickery and malice. At any rate, the last two are certainly much less frequent." — Johann Wolfgang von Goethe (1774) - https://en.wikipedia.org/wiki/Hanlon's_razor

Malice does exist. It's just good old common sense to never rule it out.