I think you missed the point a bit about his Mom. Here's a single mom who allows herself to get wrapped up in a bad relationship with a mean, violent, heavy drinking jerk. How much common sense do you think she has? Of course she let her son hang around with Carl. Good judgement is not her strongest asset.
As for why Doyle got so nervous when Carl came in the bedroom is because that is exactly the same thing that happened before...he walked in on his own Mother and her lover and he killed them both because he felt that their sin was so great. She was cheating on his father. So when he walks in on Doyle and the mom it is too close for comfort. Doyle thinks he may snap and do it again. Later on in the story Doyle is no longer nervous about Carl...he thinks he is no threat. Little does he know....
Linda...my husband and I went and saw this at the theater when it first came out...we sat and cried together in the dark. This movie is so deeply touching and yet so funny too! The whole thing with the way Carl talks and one of our favorite lines..."you mean funny ha-ha or funny queer?" and of course the Taters and mustard!!
It broke my heart when Carl told the boy ( I can't recall the characters name...he was played by Lucas Black) his story about how he grew up and what happened. Also when Carl goes to see his father (Robert Duvall) and he really didn't even know who he was.
Poor Carl. The whole thing at the end when he does what he does to rescue the boy is just heartbreaking because you know he is sacrificing himself for the boy. On the other hand if they allow him to go back to the state hospital instead of jail then maybe it is okay...that is home to him.
The other thing that stood out to me was that John Ritter probably did the best work of his career in that movie. He was terrific.
It's a real classic, don'tcha think??
**I just noticed how old the original posts were! I didn't realize this wasn't current discussion...sorry! 
------------------
~~The purpose of life is a life of purpose~~
[This message has been edited by hungree (edited 08-14-2000).]