Not necessarily. It means at least that in the mental model they have of other people they think those other people might do something. Importantly, that ment

Not necessarily. It means at least that in the mental model they have of other people they think those other people might do something. Importantly, that mental model does not need to be correct or accurately model any real person or group for that to be expressed. For an example (a silly one so people don't make a useless tangent arguing irrelevant details), if I for some reason believed that all Chevrolet drivers were fanatics and psychotics, and after someone made a disparaging comment about Chevrolet vehicles, I might say "I wouldn't be surprised if Chevy drivers assaulted someone over this". This doesn't mean I think that should happen, as it's an expression of what I think other people might do. It also doesn't actually express that other people might do this, because my mental model of those people is obviously incorrect. The only thing you can actually infer from that statement is what I think about that subgroup of people, whether I'm one of them or not, and that's just opinion.