Why isn't that enough?

Despite The President's relenting on this piece of gun control, regulations in the US are still vastly more relaxed than those in other countries. And it's that fact that gun control advocates want to change.

Even if bump stocks are banned, there are still vast amounts of very deadly weapons that are easy to buy in the US. And there are also tools exactly like bump stocks that make it easy to fire fast and fatally, mimicking much of the same features.

It's still easy to buy hellfire triggers and rotating-trigger actuators, for instance, which do much the same thing. Hellfire triggers are a little spring added inside the trigger, which means each push bounces back and fires again; rotating-trigger actuators involve putting a crank on the side of a gun, so that a person can simply turn it and have the trigger pressed repeatedly and quickly.

In addition to those tricks, the weapon that both the Las Vegas shooter and the Florida killer used remains readily available. The AR-15 assault rifle – like a range of other assault weapons – is easy to buy, despite being developed as a military weapon and being specifically calculated to bring the maximum amount of destruction.

Such weapons were once much more tightly regulated, by legislation passed during the Clinton presidency. But those laws have now lapsed, and they're once again easy to acquire – whatever the person buying them wants to use them for.