We already have laws against plenty of sins. We need more. But we need to be careful what we call a sin to avoid the slippery slope toward theocracy or autocracy.Wut? Can you clarify the point you are trying to make?
A couple of sins I'd like to see addressed much more aggressively are gambling and harming the environment.
Both of those can be addressed in part through taxes: a speculation tax; and a carbon tax.
Another behavior I'd like to see labeled a sin is lying by the press. If the press lies, it should not be considered press under the constitution - and should lose that constitutional protection. Individuals could still lie, of course - because freedom of speech - but they could no longer hide behind freedom of press, and would have to accept personal responsibility for their lies.