Nothing worse than showing kindness to someone then they rob you, the times i have had that happen! Workmen coming into your home taking little trophy's like rings or other items is sooo annoying i hide everything now, phones etc.
Most thieves appear to be self indulgent people who enjoy damaging other lives to benefit their own. I know it happens out of desperation sometimes, but I rarely see thieves who steal to eat instead of starve.
Almost in all cases, their sense of security.
if it's nicer than what they have then they'll try taking it from you
just about everything except maybe used rubbers