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You asked:

However, is there ever a case where a person can act unethically towards themselves?

I think the best existing moral theory, created by Ayn Rand, would say yes:

http://aynrandlexicon.com/lexicon/selfishness.html.

You ought to do what is in your rational self interest. Some people disagree with this idea but I am not aware of any objection that stands up to serious critical argument. For an example see:

http://conjecturesandrefutations.com/2013/12/14/tanya-on-selfishness-and-altruism/

So if you act in a way that doesn't harm other people but does harm you that may be unethical. For example, if you spend your time taking heroin because you feel unsatisfied with your life then you are ignoring a problem. The heroin just renders you unaware of the problkem for a while or dulls the sensations you associate with feeling unhappy. It doesn't solve your problem so you are just putting off doing something that would actually improve your life. This may also cover the bestiality issue.

Alternatively, is there ever a case where something can be unethical despite not being harmful to any person at all?

No. If an action doesn't harm anybody at all that means it doesn't get in the way of solving any problem at all, so it is not immoral.

You asked:

However, is there ever a case where a person can act unethically towards themselves?

I think the best existing moral theory, created by Ayn Rand, would say yes:

http://aynrandlexicon.com/lexicon/selfishness.html.

You ought to do what is in your rational self interest. So if you act in a way that doesn't harm other people but does harm you that may be unethical. For example, if you spend your time taking heroin because you feel unsatisfied with your life then you are ignoring a problem. The heroin just renders you unaware of the problkem for a while or dulls the sensations you associate with feeling unhappy. It doesn't solve your problem so you are just putting off doing something that would actually improve your life. This may also cover the bestiality issue.

Alternatively, is there ever a case where something can be unethical despite not being harmful to any person at all?

No. If an action doesn't harm anybody at all that means it doesn't get in the way of solving any problem at all, so it is not immoral.

You asked:

However, is there ever a case where a person can act unethically towards themselves?

I think the best existing moral theory, created by Ayn Rand, would say yes:

http://aynrandlexicon.com/lexicon/selfishness.html.

You ought to do what is in your rational self interest. Some people disagree with this idea but I am not aware of any objection that stands up to serious critical argument. For an example see:

http://conjecturesandrefutations.com/2013/12/14/tanya-on-selfishness-and-altruism/

So if you act in a way that doesn't harm other people but does harm you that may be unethical. For example, if you spend your time taking heroin because you feel unsatisfied with your life then you are ignoring a problem. The heroin just renders you unaware of the problkem for a while or dulls the sensations you associate with feeling unhappy. It doesn't solve your problem so you are just putting off doing something that would actually improve your life. This may also cover the bestiality issue.

Alternatively, is there ever a case where something can be unethical despite not being harmful to any person at all?

No. If an action doesn't harm anybody at all that means it doesn't get in the way of solving any problem at all, so it is not immoral.

1
source | link

You asked:

However, is there ever a case where a person can act unethically towards themselves?

I think the best existing moral theory, created by Ayn Rand, would say yes:

http://aynrandlexicon.com/lexicon/selfishness.html.

You ought to do what is in your rational self interest. So if you act in a way that doesn't harm other people but does harm you that may be unethical. For example, if you spend your time taking heroin because you feel unsatisfied with your life then you are ignoring a problem. The heroin just renders you unaware of the problkem for a while or dulls the sensations you associate with feeling unhappy. It doesn't solve your problem so you are just putting off doing something that would actually improve your life. This may also cover the bestiality issue.

Alternatively, is there ever a case where something can be unethical despite not being harmful to any person at all?

No. If an action doesn't harm anybody at all that means it doesn't get in the way of solving any problem at all, so it is not immoral.