Speaking objectively, I can think of all kinds of things that kids are exposed to that are of far more questionable content without having to go anywhere near a movie theatre.
If these people want to form groups to yell about movie content to either call out the film's producers or warn their like-minded ilk, fine. As long as they're not kidding themselves that most of the things they find offensive can be found in everything from nursery rhymes to the evening news to the bible. It all depends on how you look at it.
Most of the suggestive stuff in there would've flown right over their heads, not unlike the morbidity of many a nursery rhyme. "Rock-a-bye baby" has a baby falling out of a tree!
Personally, I think if they'd like to defend their children from the media-saturated world, a good start is as simple as communication. Kids are people too, and people always respond better to respect.
There's no need to dumb things down. Trust your instinct as a parent and respect your child as a person. Transformers was PG-13, and was at one point rated R. The movie was intended for an older audience, and a simple amount of research would reveal that to any parent. The rest is their responsibility, not Hollywood's, or the target audience of the film (the people who inevitably pay the price for these little "outrages").
In any case, in the Transformers movie that came out when I was a kid, Spike said "****", and Optimus Prime
died!. Also, a Junkion kissed a Dinobot.
The worst effect all that had on me was over two decades of throwing money at the franchise in question.
