Yes. We are omnivores for a reason. Omnomnom.
1)
We are omnivores so we can be vegetarians, carnivores or anywhere in between.
We have free will so we can choose.
We are moral agents so we ought to choose.
What options are valid options for this choice? (There is not necessarily just 1 right option. However there might be just one right answer.)
2)
Yes. We have [OPTIONAL TRAIT] for a reason. Therefore we should exercise that trait. Hey we can murder for a reason you know.
The argument is a logical fallacy as displayed above.