Yes, which is more or less the whole point of this argument: nobody's perfect, but people can be 'on average' good; but that's not the same as equating them with saints, it just isn't realistic (and even the saints aren't saints in terms of absolute, they are just declared to be so, by people who themselves too are very much flawed).

So let's not resort to theoretical absolutes. I don't know where 'here' is but every culture has similar idioms but at the same time every culture has something about being careful about meeting your heroes.