2. You Are Going To Die One Day
Though horror films typically end with the one smart teen who decided not to take drugs and get her kit off managing to kill the crazed killer, so is not true in real life; as they say, when the force stalking you is Death itself, nobody gets out alive. If films can be a tool to educate and even act as therapy for our issues, perhaps one of the most prominent ways cinema can do this is to teach us about death, and desensitise us to what is arguably "the last taboo". Of course, we're unlikely to be munched to death in a zombie invasion or get shot down by John McClane in a hail of bullets, but even a flippant regard to death keeps it lodged in our consciousness. It's a convenient plot point to hammer home some emotion or visceral drive in everything from dramas to action films - death sucks, but it's something we're all going to encounter one day. Without films, we'd probably all be a lot more terrified of that fact, though might have found it easier to ignore in the mean time.