I think this means everyone is able to be a thief because the next sentence says crimes is a matter of access. Basically everyone has access to something that can make them a thief.
I think this means that everyone makes a mistake, or does something they shouldnt for their personal gain, or out of spite. The line between right and wrong is always thin at one point in someone's life, and the basic meaning of this sentence is that everyone has done something they shouldn't at one time or another.
