Mainly, to have a good time. But at the same time, they get some moral message from the content of the movie, even if they are not so much interested in the message. And boredom is not a mandatory feature of the high quality movie, American directors, IMO, understood this better than the Europeans (including many of the Russian and Israeli ones); director that shoots boring movies does not respect his customers...
depends what audience they make their movies for. not everyone is interested in the mass production.
If you want to justify investment of $50-200 million, then you need a very vast audience. But this does not mean that the resulting movie must belong to the B category; it may be quite a professional one.
exactly. aim is quantity, not quality. it may be a good one, on occasion it happens.
the absolutely amazing wonderful american movie industry is targeted to the 15-29 yr old with primary content being teenage sex adventures-john wayne/rambo violence adventures and finally the big sellers of dumb and dumber. How it can be construed as moralistic/didactic in any sense of the word is inane. but now and then good films are made in spite of Hollywood not because of it.