I don't think the fact that the person is a teenager really bears any significance as to how negligent a company is. Historically teenagers have done massive damage as sole actors in numerous roles.

The only thing between the inside of a home and the outside is a thin layer of glass. Should we hold home owners responsible for people breaking in and stealing? Lots of things are fragile, we have a laws to act as a deterrent to violations

We do in some cases.

Someone breaks in and steals your stuff? We generally don't care, because its solely your problem.

Someone breaks in and steals other people's stuff that you held, or stuff that's dangerous to others? Depending on what it was, you may be held liable if you didn't take appropriate measures.

If the stolen stuff was, for example, sensitive private information, and you didn't have it in at least a locked cabinet, you may be liable. If it was a gun, in many jurisdictions, you're liable. Your car gets stolen _because you didn't secure it correctly?_ In Germany, you're liable for the damage caused with it!