Reacting to events that happened to SOME as if those events happened to ALL is what has driven sex offender policy. News spreads instantly, details are broadcast endlessly. We are encouraged to react with the same outrage those close to terrible events must feel.
As unthinkably horrible as what happened to Megan Kanka, Adam Walsh, and Jacob Wetterling was, it was a bad idea to look at those individual events and write laws in reaction to them. Those laws would not have stopped the bad things from happening to those children--or to other children--but those laws continue to ruin lives and wreck families all across the country. And most of the laws wrecking lives and families are for crimes not even close to what happened to Megan, Adam, and Jacob.
So...Charleston. Maybe the guy shouldn't have had a gun...but let's not write gun laws as if we can stop the next awful shooting from happening. We won't. Maybe the guy hated black people...but let's not decide policy as if we can control what happens in people's hearts and minds. We can't.
Let's not leverage the grief of the affected community to further our own political aims.