As a spin stabilized shaped projectile, the HP68 is 25 times more accurate than spherical projectiles.
In addition, at 7.8 grams, it is more areodynamically stable than lighter 1.5 to 6 gram projectiles. The heaver weight makes it less succeptable to aerodynamic turbulance and cross winds.
First lets be completely clear. Without weighing local laws or personal convictions, a traditional firearm is the most effective choice for self defense.
However, there are many reasons people choose less lethal.
According to the US Department of Justice 98% of less lethal deployments do not result in fatalaties. Unintended deaths are usually the result of larger 40mm projectile hits, hits at extremely close range, or hits to sensitive areas of the body, such as the head, neck, or ribs directly over the heart.
According to the US Department of Justice, 93 percent of the reported incidents involving impact munitions were resolved without officers having to fire their guns, even against armed individuals. And 98% of incidents were resolved with 10 or fewer rounds fired.
We're not lawyers offering legal advise. Every situation is different. You have to know your own neighborhoods, capabilities, convictions, and the level of responsibility you're willing to accept.
However... if it can inferred that someone who chooses to employ less lethal has a 93% chance their opponent will stand down, and there's only a 2% chance of lethal injury, considering the 97% chance of going to prison for homicide, we feel less lethal deserves serious consideration.