These movies are space opera fantasy. They are part fairy tale, part serial camp adventure like the old flash gordon and buck rogers serials, part fireworks- ohhh ahhh special effects. They are for fun, good guys vs bad guys, shoot em up with "ray guns". Nothing more. They are not political commentary, they are not a religion. They are what they are. Fun. And if kids get excited about space travel because of it or learn that being a good guy is the right thing to do, then that is a bonus. If the lines are sappy, if they are campy, just enjoy the ride. I sure have.
Just for the FUN of it.