Isn't it dangerous to give cracking tools to everyone?

That depends on your point of view. Some people have complained that giving unrestricted public access to programs like COPS and Crack is irresponsible because the "baddies" can get at them easily.

Alternatively, you may believe that the really bad "baddies" have had programs like this for years, and that it's really a stupendously good idea to give these programs to the good guys too, so that they may check the integrity of their system before the baddies get to them.

So, who wins more from having these programs freely available? The good guys or the bad ? You decide, but remember that less honest tools than COPS and Crack tools were already out there, and most of the good guys didn't have anything to help.