Some of the following has already been said, so I’m sorry for any repetitions.
As far as I remember Bandura’s theory, it does ignore a few factors (correct me if I’m wrong, this is just how I remember it).
- Individual predispositions and own thinking/judging. Not everyone is equally susceptible to things that promote violence, otherwise every first-person shooter gamer or violent dreamer would be a living murder machine.
- The possibility of a drive which would be more or less the cause of aggressive urges. Bandura sees the human as quite determinate by its social environment, and doesn’t pay any attention to the chance that an aggressive drive (or other genetical predisposition) may exist. If such a drive exists, then that means that violent media/dreams or anything like that are at worst reinforcements of already existing aggressions and at best are useful as an outlet for said aggressions (comparable to martial arts, with the only difference that such sports are more socially accepted).
For violent media/dreams to act as an effective reinforcement there have to be a few more underlying things that allow them to act as such: A need to harm others (accompanied with a lack of inhibitions), a lack of empathy for other living beings, an inability to tell reality and dreams/games apart, and so on. I think we should search the causes for aggressive behaviour in other things than in games or dreams. Violent behaviour in dreams or games does not harm anyone, and although I agree with you that violence in LD’s is something that should be thought over twice, it may be a good outlet for some. If it is morally acceptable to harm DC’s just for the sake of harming something, is a question that should be answered by the individual dreamer alone. After all, it does not affect anyone else if the dreamer is able to tell why doing what he does in dreams is not acceptable in real life.
TL;DR: I do see that you dissuade from violent dreams because it can/may cause aggressive behaviour, but it just as well can/may be a harmless outlet of aggression. We shouldn’t focus so much on violent dreams or media. Someone who’s never been prone to be aggressive and who has learned where society puts the limits will not suddenly commit acts of aggression when killing DC’s. The cause of aggressive behaviour lies deeper (either a drive or lack of socialization/education), in my opinion.