Even if they believe that animals can suffer, they also have to believe in utilitarianism in order for that belief to be reasonably described as "willingness to hurt others", because "willingness to hurt others" also has an implied "significantly", and that means making comparisons that say that the gain from harming animals is smaller than the loss to the animals.

Technically, there are beliefs other than utilitarianism which can lead to that but I suggest that they would be rare among meat eaters. For instance, "you should never eat things that suffer no matter what" is a deontological rule which would also lead to the conclusion that meat eaters are willing to hurt others significantly (since the rule implies that all suffering significantly hurts others). However, I doubt many meat-eaters have such rules.