Five months later, we still don’t know why Stephen Paddock rented a room in a Las Vegas high-rise and decided to commit one of the deadliest shootings in U.S. history, killing 58 and injuring more than 500.

Despite the carnage and initial chatter among members of Congress — and even the National Rifle Association — about finally taking concrete steps to lessen the chances such an event could be repeated, the federal government has again proven itself incapable of taking the issue seriously. Fortunately, several states and cities have begun trying to make up for Congress’ dereliction of duty.

After the shooting, Columbia, S.C., became the first city to officially ban devices called bump stocks, which allowed Paddock to turn semi-automatic weapons into ones that could fire more rapidly and consistently. Cities such as Denver have followed suit. More than a dozen states, including Massachusetts, New Jersey and Connecticut, have or are considering doing the same. It’s a small measure, and in some ways symbolic, given that we don’t know how many people have bump stocks.

It won’t prevent every mass shooting. It won’t stop every person determined to cause as much harm as possible. Guns, semi-automatic or bump stock-enhanced, are not the only way to commit massacres and unleash havoc and terror. So even if our leaders in Washington reverse course and get busy on bipartisan legislation banning bump stocks, no one should declare victory over the scourge of gun violence that is the worst in the developed world. Only diligent, painstaking law enforcement work, along with a strong partnership with the community, can root out the most dangerous among us before they can cause too much damage.

But the decision by a growing number of cities and states to act in the face of inaction from Washington is welcome nonetheless. It’s not as effective as more comprehensive background checks, better mental health care, stricter training requirements, or any number of other measures. Still, it puts down a marker.

So far this year, more than 5,300 people have been shot, nearly 1,500 of whom died, including 60 children.

That list will only grow. At some point, we must muster the courage to do something about it. Banning bump stocks should be only the beginning.