To question actions and intentions.

Many things can make a person ''dangerous''. My question is who or what in this case is more dangerous? A person who's actions are considered dangerous or a person who's intentions are or could be potentially deadly? Example: On one hand there is a man who steals, fights, and generally causes trouble. His actions to those around him are considered dangerous, reckless, impulsive, things of that nature. He poses a threat because of the level of atrocities committed correct? Now on the other hand you have a man who has no record of these behaviors. He never steals, cheats, lies anything of that sort. Now the difference between the two is the second man would eliminate anyone who poses a threat to him, or anyone close to him without hesitation. Can will surpass experience in this particular situation? Who poses more of a threat? If a man will only go so far but knows all to well how to get to that point, is he more dangerous than a man who would skip the previous man's process in order to kill the threat imposed upon him? While thinking this over it should be taken into consideration that both type of men exist. As a side note; knowing this should help open eyes to the fact that reading a book by its cover depending on the type of book, can still result in a paper cut. Please give feedback on who in your opinion is worse or any examples of these types coming face to face.