Well, animals USED to have plenty of food. But because of our influences, we have killed off some natural predators of certain animals. So they produce waaaaay more than can be fed. Natural selection of things wouldn't really let this happen. Given ample space, animals can feed themselves and be healthy and get enough food. If there isn't enough food then some of the animals die off. That isn't cruel or a terrible life, that is how it SHOULD be.
Animals struggle because of things we have done to them. But by no means is our life much better than theirs because we have laws and regulation.
And where are animals CRUEL to one another? Cruel for no reason.
Crime came after we started to settle down. There is strong anthropological arguments saying that we were much, much friendlier before we started farming. Once we started farming, things started getting much worse, crime appeared and it got crazy.
I don't think we are savage beasts. I just... can't imagine that. Do people really think that if we had no laws, people would start murdering other people? I don't think that would happen. But maybe I am giving people too much credit. The most that would happen is we would openly steal. People already break the law, lie, steal, and cheat... even with consequences looming. People would still at the same way, just do it more often.
We have a fair share in the suffering of a lot of animals, there's no doubt about that. But I'm referring to the core nature of the animal. Meaning when they have space and enough food.
Take predators for example, that's a widespread branch that resorts to cruelty almost on a daily bases. Sometimes even devouring creatures when they're still alive. And not only predators, there are even plants that have cruel defense mechanisms designed to poison and/or kill. In matter of fact, the cruel is not only a part of nature it is a essential one, it keeps things fair amongst species.
While humans lived in the wild amongst animals in that past, and in essence it is possible, we're not exactly that kind of human anymore. We have since gained elaborate communication skills, great knowledge of psychology (and how to manipulate it), tried and proven wars tactics, and so on. If society had never happened, perhaps then no consequences wouldn't be such a big deal, but with what we know and can do in our modern age, where everyone is empowered, it's a disaster waiting to happen. And that's the pretends that I base this on. What would happen is regulation and laws were gone
today.
It doesn't take everyone, a mere 1/4th would do. Things like extreme religion and the likes don't oblige to laws. Having the laws/regulation gone would give exactly those people the free opportunity to do whatever they wish.
You have to believe me when I say I'd like nothing more then utter and complete freedom, I hate having to work around regulations, permits and rules. But realistically it isn't achievable the way things are today.