Opportunity cost is a concept meant for business. Not for human actions.
For human actions we always best the full cost. Not the incremental one.

It’s not just one more abuse
Or one more one night stand
One more act of bribery
One more act of fraud
One more act of cheating

It’s all of them put together. Because the most recent one is as grave as the first one.

Your reputation today is a reflection of what you did this morning!
Yesterday doesn’t matter