toonami fanbase: "we want darker, more mature shows!"
demarco: "k, here's black lagoon & hellsing ultimate"
fanbase: "noooooooooooo, not that kind of dark & mature"
demarco: "uh, akame ga kill & tokyo ghoul?"
fanbase: "yeaaaaaah, that's it"
But I guess it's like what I said during the 2nd episode, I can see why it's popular with the teenage demographic (i.e. junior & younger high schoolers) because it's their "gateway" into "darker" anime/manga, so they get this sense of "yeaaaaah, this is why anime/manga is better than those lame american cartoons, this has more violence & gore!"