The environment was different for each of those movies when they were in production. Even then, it's not fair to point at those movies when we've only seen one sneak peek and not the entire movie to see if R is justified and compare TKJ and see if R is justified for those movies you listed. Plus, you have to get that the times change and the "ratings creep" phenomena is prevalent everywhere not just the rating of this line of animated movies.
I can understand how some are concerned with an R rating. But for now in the absence of more information, that's better than a NC-17 rating.
I can understand how some are concerned with an R rating. But for now in the absence of more information, that's better than a NC-17 rating.