It is a reasonable assumption indeed, but it shouldn't be mindlessly trusted, and the burden of proof of innocence should never be on the defendant. If some id

It is a reasonable assumption indeed, but it shouldn't be mindlessly trusted, and the burden of proof of innocence should never be on the defendant. If some idiot system places you on the scene of the crime, fine, good starting point, it'd be reasonable to start investigating whether you were there, but it should count for nothing in and of itself. There should be actual evidence that you were there, like DNA, fingerprints, actual photos, and a lack of any countering evidence.