I don't care if the idiot is doing it on purpose or not. That's totally irrelevant. The horses are not suffering any less just because the owner isn't neglecting them intentionally. There is no excuse. If you can't keep your horses in good condition, you don't have them. Period.
I don't think it's just mud they're wallowing in. How often do you think the guy picks the manure out of his paddocks? That open wound on the one horse is an invitation for infection. And they are most definitely underweight.
Excuse me for being disgusted with the poor, helpless owner who's sitting in his house while his horses are outside, up to their elbows in filth.