Kid? Are you kidding, which arc you watch, filler?, you're a poor guy? We're now discussing the manga which is way too far away from the anime storyline.
LOL, Chainsmoking/pervert Sanji, Crocodile, CP9, Kuma, Whitebeard, Blackbeard, Kizaru certainly not a character for kids to watch.
Maybe you're referring the antics between luffy, usopp and chopper, yeh there are all acting like kids the whole time, but when the time to kick some *ss, it's serious sh*t.
What do you think reason that this anime is heavily edited when shown in north america?