The problem is identifying the location of the source. A laser beam is invisible unless it passes through a medium like smoke. During the Iraq war, the military developed a system for automatically returning fire (with extreme prejudice) based on locating the muzzle blast by sound. Has the military solved the problem of tracking laser fire?
The videos showed LOTS of green laser beams all over the place. More than one of the scum was armed with a laser.
A phase conjugate laser (PCL) can emit a high energy pulse based upon a target’s reflection of an illumination pulse. The reflection from the target enters the PCL laser optics and is considerably amplified. That amplified energy is emitted essentially pre-focused on the target’s position at the time of the reflection of the original illumination pulse. Advanced deformable mirrors and predictive algorithms can slew the shot somewhat to compensate for rapid traverse movement combined with extended delivery time of flight.
A laser of a sufficiently close match to the PCL frequency of operation could enter the PCL optics, become amplified, and prompt a return at high power. Would likely be tricky to attain such a match.