(DEVIL'S ADVOCATE) Am I allowed to go to businesses and try to pick the locks, look inside, and then report to the business owner that their lock was pickable? Well... yes, but I'd probably be reported to police. Websites, like locks, aren't bullet proof. How many web applications out there don't have a security flaw somewhere? Doing penetration tests on unwilling victims is risky. Trying to break wifi, company intra…
With a physical lock, you'd have to pick the lock each time you wanted access, and avoid being seen. The bar for repetitive attacks on the web is much lower, because you only need to write the "lock picking" script once, and then you can use it indefinitely, disseminate it, etc. A poorly protected website is more akin a house with no lock on it at all, and reporting that "this house has no lock" is not a criminal act…
What about this: seeing the house has no lock, opening the door, going inside, counting the money in the owners wallet, putting it back, then reporting that "Anyone could steal $300 from that guy".