This topic is tad judgmental from the first few posters. Perhaps you should really listen to people, instead of foisting your ideas of what is best for their family onto others. This is not a mompetition. Everyone wants what is best for their family and child, please try and remember that.
My son is 15 months and is RF. But unless one of us sits in the back with him (his carseat size and the size of our car make this hard- only I fit, not DP, which means he is the only one to drive, ever- when we are together and it is very difficult for one of us to take him somewhere without another adult- which is not always possible), he will work his way out of the seat trying to see us. I shit you not. He wants to see mama and daddy and nothing will stand in his way. This is why we are considering FF- he meets our state's requirements (over one year old and over 20 pounds) so it is not legally "wrong" as the OP stated.
I am fully aware that it is safer in an accident for my son to be RF, but what about other accidents, like the one caused by my son trying to crawl into the front seat when I must take him somewhere on my own without DP?
To assume people do not know what they are doing (I know how to install and adjust the straps on my son's seat, so the sarcasm is unwarranted) when they do something different from you is uncool. And perhaps they were sheepish with you in the first place because they knew you would be this judgy. Sheesh.