Is there a thing as too much HP's?

[Andy]

so im curious what else should be regulated in the name of harm to society?

Large houses are more harmful to build, and use up more electricity and resources, and no one really needs 18,000 square feet for a small family. So shouldnt houses be limited in size? Like say, 1000 sq ft per occupant?

A passenger jet pollutes more in one coast to coast trip than an SUV in its entire lifetime. So shouldnt we limit people's personal jet travel in the name of society?
Same goes for non-business related driving. You get 12,000 miles per year, over that and you get fined.

and aboolishing recreational motor sports is of course a given as well.

All are legitimate questions that should be asked from time to time but you have to do a cost/benefit analysis. But all of your examples are straw men better suited for an argument than a discussion.

I think most would agree that we should promote/teach personal responsibility rather than mandate corporate responsibility. The problem is that very rarely do we agree about the impact of our personal choices.

+1 with the caveat that if people make responsible decisions then corporations by extensive should make responsible decisions as well.