Legal Wrongdoing

If you discover a way to gain something by doing wrong but legal actions, which should be your choice?

1. "Why not! It's legal."
2. "It doesn't look good. I won't do it"

Indeed, there are some people (with some power) that are capable to choose another choice:

3. "It shouldn't be legal, let's try to make it illegal."

Is this a good choice? ... Is it chosen?