You think very lowly of other animals if you think they have no morals, or no discerning of good and bad.

Or are you valuing your specific moral more than theirs? Because that's a very classic specist reasoning, with no basis whatsoever except human arrogance.

Also, humans rape other humans too, so how do you justify this? Are rapists not moral agents? You consider them beasts, different animals than yourself?

Then what makes a human a human, what makes them the moral agent you talk about? Is it the respect of the law? Is it a particular neurological state?

More importantly, do you really need this sort of validation to be "good"? Do you need to believe that you are different? That you have a responsibility? That you are "better" than other animals?

Are you not capable of being equally "good" even knowing that morals are relative? That there is no actual universal good? That you have nothing more than other animals?