Loyalty is not something that can be made to happen except in your own self. by example one leads and others that are open to being influenced may or may not follow that lead. it's a very soft influence and something that cannot be forced or it goes against the idea of mentor/leadership.

The part that I think may help your understanding is that you need to accept that people will be or won't be loyal all on their own initiative. That's just it, some people are naturally born to be loyal to those they care for and some people are disloyal by nature or at least find it to be something they don't consider that important.

I highly doubt that anything you're doing or try to do to change this will work. Find loyal people to be friends with... I know that sounds simplistic but it really is a part of what type of person one is.