I would guesstimate that less than 1% of the animal suffering that goes on in this country is as a result of genuine cruelty. Most people, with the notable exception of myself, if certain folk are to be believed, do not set about to be deliberately nasty.
Things go horribly wrong for many animals however, when indifferent, or alarmingly often, "nice" people fail to either, inform themselves, take action, or take realistic stock of the situation they find themselves and their animals in.
Proverbially ignorance may be bliss, but that is generally extended only as far as the person involved, and the animal/s existence is usually FAR from blissful. NOT KNOWING the minimum care requirements, nutritional needs, or basic signs of illness in your pet/s or livestock is all too common, but NOT acceptable. If you don't know these things it is a bloody good idea to inform yourself BEFORE you acquire the animal/s, but failing that, as shortly after acquiring them as possible. The correct time and place to be asking for nutritional advice for your pony is NOT 3 weeks after it's condition score has dropped to 1, on a message board!
There are some great resources out there online, which can tell you exactly what your horse, (or other animal), needs every day, and Google will find an awful lot of them. It amazes me too, how many competent, knowledgable horse owners know plenty about how to feed, but have never stopped to think about the actual numbers and energy quantities involved, and therefore find explaining how to feed to someone less experienced quite difficult. I personally find it very helpful to have concrete numbers.
As certain major historic events tell us fairly pointedly, major atrocities can happen when people turn a blind eye, or fail to take action, and animal atrocities, (and more minor suffering), occur all too often as a result of these. Sometimes, like in the case of intensively farmed poultry, or pigs, society, almost as a whole, turns a blind eye, in the interests of economic gain, which I guess may make it harder for individuals to stand up and be counted, or take action when they see smaller more personal suffering occurring in their own, or neighbours' backyards. Those who are prepared to take action are often all too few, but deserve our thanks, provided the action taken is reasonable and responsible.
By far and away the hardest people to deal with are those who cannot grasp the REALITY of the situation with their animals. If you cannot convince someone there is even a problem, then there is no way in hell you can hope that they'll endeavour to fix it, and for some reason an awful lot of "animal" people seem to have anything ranging from smallish blind spots, to elaborate fantasies and delusions regarding the animals they take on, or own.
It might be anything from refusing to see that Fido, is no longer the gleaming, flowing, golden coated, retrieving wonder he was in his youth, and is now dragging his arse end around leaving a trail of urine, to thinking it is a good idea to "rescue" an animal whose prognosis is so poor that it dies somewhat horrifically on you, to sincerely thinking the 3 year old that has been severely malnourished since it was in utero, is actually going to make a decent racehorse.
It is often helpful, if you have people around you whose opinion you value, and judgement you trust, to ask for their advice or input regarding whether it's time to have Fido put down, whether the half dead newborn kitten/s you've just brought home should have a one-way, or bi-directional trip to your local vet, or whether you should sell, or give away 90-99% of the horses you own and concentrate on feeding those left, and paying your bills. And if perchance you've managed to drive anyone remotely helpful like this away, then forking out some money and paying a professional, like a vet for example, for their advice is a fucking good idea, and more or less the only responsible option left open to you.