Many crimes are committed out of opportunity rather than careful obstinate planning, especially lock picking / breaking and entering: https://popcenter.asu.edu/sites/default/files/opportunity_ma...

In other words, if there was no lock, I'd enter houses that I can reasonably think are empty / populated by feeble elders myself eventually, however "honest" I appear to be now when I'm surrounded with locks and barriers to crime in general.