As is virtually every other series you listed, bro. Anything is capable of utilizing adult subjects no matter the targeted age group (i.e. Legend of Korra on Nickelodeon), but they're packaged in ways that most people either won't notice or take seriously/offense to.
And in the end, shōnen is a genre designated mostly for young adolescent boys. It's SUPPOSED to be kid friendly, doesn't matter what subjects it uses (only real exceptions to that in this day and age are Attack on Titan and Death Note due to their highly death-oriented plots). Want less friendly material, watch some seinen anime (I see Black Lagoon on your list, so you're already in the ballpark).