Yes, Jack could not resist anything he did not understand. Even though he was afraid of the mobsters, his curiosity outweighed his fear and he could not rest until he understood his enemy and their motives. He should have been more afraid of them if he knew what they were capable of, but he just didn't know. And his total lack of fear made the gang cautious of him.

Yes I made a simple banner. Thanks @nancybriti. You're awesome.