Having said that, it is also up to us as a society to determine what is and is not harmful to society as a whole.
Finally, they are however, also subject to the consequences...health-wise, emotionally, mentally, and, in my faith, in the life hereafter.
Absolutely considered, we may be free to do evil, but we do not have a right to do evil. The Ten Commandments and the Golden Rule prove that God does not give us the right to do evil. This may seem like a quibble, but it's an important distinction.