Depends on which ones. The girly cartoons were vapid. Care Bears was vapid, Rainbow Bright was vapid (though it had a pretty good villain)... not to say they're terrible (though I'm pretty much reprogrammed to hate that stuff after the 90's revolution), but depth was a thing that was commonly quelled by the parental groups and network heads afraid of parental groups. There were some pretty dark moments in the boy's action cartoons, though... but frankly, after Batman TAS came out, nothing quite seemed as dark since. Not even some of the new DC cartoons that are pretty dramatic. Even Brave and the Bold had a dramatic episode from time to time. The only episode I've seen so far of the new Transformers Prime (the one where Bumblebee can't transform because a bio-mechanic component in his system was stolen and they explained how they can't just build everything back) was pretty dark and deep too.In some cases probably, but mainly to sell toys, lol. However I would also argue that cartoons in the '80s often actually had a darker streak that cartoons just don't have the brains for today.
Still, I don't think G.I. Joe ever went into questioning wars. it was pretty much straight up good vs. evil, black and white stuff. If they made an episode where the US government was making deals with Cobra to get cheap, opportunistic political points (something that pretty much happened in the 80's) I'd tend to agree more.
Seriously... Saddam was our friend back then. That went well.