I agree nothing is indestructable. Even a red head will stop your typical junkie breaking into homes to feed his habbit. Crews doing high end stuff forget about it. We had 3 gun stores in the Chicago area hit in the last year. The crew got into one which had a pretty good set of bars and a very tough door, got most of the guns in the store ans out in under 10 mins.
"....The swords of others will set you your limits".