Why is it so hard to find good leaders that want to offer great mentorship?

That's the environment the Army has created with the drawdowns. Leaders who spend their time taking care of their Soldiers and mentoring will quickly find themselves being shown the door because their less selfless peers will have spent all their time going to Audie Murphy boards, going to schools, going for badges, getting ASI's and SQI's, doing college on work time, going to the gym all the time and generally being out for number one. They are going to look MUCH better on paper, thus will be promoted...

It's the hunger games. If you don't look out for you, no one else will...

May the odds be ever in your favor.

I think the mentors are out there; you need to reach out to then when you do meet them and ask them. Leaders don't know who does or does not need a mentor. Nor do they know who does or does not want one. I'll agree with you in that there are plenty of people more focused on the next pay grade than mentoring or taking care of those under their charge, but I would argue that there are plenty who are willing to do the mentoring. Just like mentoring, finding a good mentor is a two way street. Reach out when you see one. Im not sure I have ever heard one say no.

Because the army starting to hit a point where rank matters most, because that's a hope in not getting cut from the team with this downsizing. It's also a matter of this, something nobody wants to hear, but something people don't get called out on, it's a matter of pride and laziness. The card of "that's private work", or "below me" gets played to much these days, and in turn makes it where leaders just don't care to put the effort in to mentor soldiers.