In To Kill a Mockingbird, when he is asked is he should get a change of venue for Tom Robinson, the sheriff says, "not much point in that, now is it?" What is the sheriff implying?

Heck Tate is implying that the end result, or verdict, will be the same no matter what venue they use. Tom is a black man accused of raping a white woman..... he will be found guilty regardless of the venue.