If we banned or restricted all activities that affect, harm or have the possibility of harming other people, it wouldn't be a very nice life. Let's look at what can affect or harm other people. Non-obese people are harmed by obesity, as they have to pay more for health care, through either higher taxes or higher insurance premiums. That harm could be reduced by a national version of a measure introduced in the Mississippi Legislature in 2008 by state Rep. W.T. Mayhall that in part read, "An act to prohibit certain food establishments from serving food to any person who is obese, based on criteria prescribed by the state Department of Health." The measure would have revoked licenses of food establishments that violated the provisions of the act. Fortunately, the measure never passed, but there's always a next time.
The National Highway Traffic Safety Administration reported that in 2010, nearly 33,000 people were killed in auto crashes. That's a lot of harm that could be reduced by lowering the speed limit to 5 or 10 miles an hour. You say, "Williams, that's ridiculous!" What you really mean to say but don't have the courage to is that to save all of those lives by making the speed limit 5 or 10 miles per hour is not worth the inconvenience. Needless to say -- or almost so -- there are many activities we engage in that either cause harm to others or have the potential for doing so, but we don't ban all of these activities.