It sounds like you two are disagreeing over the unmentioned error rate. If I get a parking ticket unjustly, it may piss me off, but it isn't a big deal. If I a

It sounds like you two are disagreeing over the unmentioned error rate. If I get a parking ticket unjustly, it may piss me off, but it isn't a big deal. If I am convicted of a serious crime unjustly, it matters far more. Whereas the grandparent, I think, is asserting the guilt or innocence is (or should be) an objective fact independent of what anyone does about it.