You like ALPA? Good for you. However, it's not the only good union; it's not for everyone. The largest airline in the world (American) doesn't want you; UPS doesn't want you; we don't want you. So what. We're happier with our own in-house union. Why do you have such a hard time getting that through your head?
Because it's worse for the industry and the profession (and it's actually worse for you, even if you won't admit it).