As far games go, I don't believe they ought to be free software. Stallman
himself stated somewhere that works of general use should be free and so
software should be free.
Games are not works of general use (even though they are software). They are
pure entertainment and one can work without them just fine. I see no issue at
all in using Wine to play commercial games. Buying commercial games doesn't
harm the cause of free software either. How should it? There is no monopoly
on the gaming market, we have a healthy free market competition there. Hell,
some games even ship with special editors that enable users to create
modifications!
I'd even go so far, as to tell that consoles are allowed to have proprietary
operating systems as long as the console isn't meant to deal with everyday
computing like browsing the net and whatnot.
Being unable to change a program that you need for working or simple
essential computing may become a problem by threatening your rights as a
citizen and a human being. Being unable to change a game to fit your needs is
just lessening the entertainment value of the game for you. No moral issue
here, not at all. Besides that, games are supposed to be works of art to some
point. To wish to make them free and open source is besides the point, you
are supposed to look at them as is, it's not an instrument that can only
measure it's value in how well it fits your needs.