Maybe I should restructure my original post.
I never said to ignore cribbing. But, if there is nothing you can do about it, then you can't do anything about it. Why make the poor creature more miserable just to ease your own mind. Make sure he can eat well, and that the stressors of his environment are low. I never put my gelding in a stall so he could spend his days cribbing. He always had free choice. I made sure there was no competition during feeding, and I NEVER showed him. He had enough of that.
Eventually, I had to sell him. (stoopid ex husbands request, as he was originally his horse) and he eventually died of old age in the care of a sweet and loving family.
Just make sure you make their life as comfortable as possible. Keep his environment safe from any damage he may cause from his cribbing. Make sure he can chew his feed well, has access to plenty of water, worming and dental care.
Sometimes, thats all we can do.