Modes is definitely the answer here +boogie2988
I agree completely with your point by not wanting the developer to dumb down the story just to appeal to the mass market, however, sadly this is now yet another game that my 9yr old son cannot play.
He is very mature for his age, so I am flexible with a lot of what he plays, but I do tread very carefully with online gaming (for obvious security risks) and inappropriate content which appear in campaigns (you simply can't unsee things). This is particularly frustrating with open world games... e.g. GTA 5, which is potentially an amazing game for even very young kids to play and explore if it weren't for the graphic campaign and cut scenes... much of which doesn't actually add a great deal to the game and is seemingly included for the shock factor in an attempt to make the news / press. The same can be said for many other franchises such as Far Cry, Assassins Creed, Skyrim and similar.
So... back to my point of modes... Why don't they include modes which filter out / limit / adjust the content? It wouldn't take much to produce a few variations of cut scenes to maintain story integrity depending on the age setting selected... everybody wins, and the developer has the opportunity to make even more money by opening up the market. This applies to all genres of open world games including those mentioned, and linear story based such as COD (which actually dabbled with the concept in Black Ops), Battlefield and similar. Perhaps also include a sandbox / roaming mode to allow open exploring and casual play without exposing younger gamers to campaign content all together?
I could go on, but you get the point! :)
Keep up the good work!