Animal factory farms are immoral.

Which is not saying a lot. In the link there are listed most popular stances on animals and morality, which differ considerably.

Fallacy Of Red Herring

Argumentum ad populum

Evolution is not observable.

Then you have no idea what Evolution is.

Fallacy Of Red Herring

Ad hominem

Evolution is not observable.

OP seems to have a general problem defining "change" and how we as humans can observe change. It has absolutely nothing to do with the original premise anymore and therefore I consider OP's further comments to be irrelevant.

Fallacy Of Red Herring

Ad Hominem Poisoning the well

Evolution is not observable.

The premise you linked has more than a 90% objection rate. It's not a good idea to link to an almost entirely rejected and falsified premise.

Fallacy Of Red Herring

Argumentum ad populum

The taking of a life is not immoral.

If every human was polled "Is the taking of a life immoral?", almost all of them would say that it is immoral.

Fallacy Of Red Herring

Argumentum ad populum

Changing your gender/sex is unnatural

I beg to differ on your premise regarding "we can exclusively define what is natural to humans" unless you supply such a definition. Otherwise why wouldn't using instruments (for example, for a sex change) created by humans be natural means for doing any particular thing for a human being?

Irrelevant Conclusion

Such a definition for natural was given.

Changing your gender/sex is unnatural

fuzzydunlop, it is why it is a "however" and not a "but".

Irrelevant Conclusion

The purpose of the 'however' function is to add something that furthers the argument without supporting or denying it. A good example of this is the other 'however' statement in this argument tree which attempts to further the argument by stating we need a more elaborate definition of natural. Stating that what is natural is not necessarily right or wrong does not further this specific argument because it does not help use determine whether changing one's gender is natural or not. Whether natural things are right or wrong is a separate argument that should be talked about outside of this argument.

There is no such thing as a "good" police officer

Police are under no legal obligation to protect and serve.

Fallacy Of Red Herring

Just because police officers are not obligated to protect and serve does not mean that there are no "good" police officers. Officers can still protect and serve even though they are not obligated to. You have also not supported with evidence that protecting and serving is necessary for being a "good" police officer.

Changing your gender/sex is unnatural

People change sex in many cases because the are uncomfortable with the imposition of gender roles upon them. These gender roles are themselves an artificial construct and are unnatural.

Fallacy Of Red Herring

A possible, unnatural reason for changing gender does not determine whether the act of changing gender is natural or unnatural