In addition these less than lethal can be a way to familiarize family who may not be as proficient with any firearms. Similar to buying a kid a bb gun, learn weapon safety and skills in a safer environment.
Due to the reusable nature of some of their ammo it can be a womderful addition to any armory.
Thats why i bought one for my 70 year old mother in law. She doesnt feel as nervous training with a byrna and we are progressing to actual sidearms now.