The society shown in “Into the Badlands” loses to the first one that shows up with guns, cannons, etc.
Kung fu doesn’t matter much when someone can put bullets in your body long before you can reach them.
Gattling guns have a track record of mowing down lines of attacking infantry - super-ninjas or not.
Somewhere during the lead-up to the show
it is explained that guns were banned long
before. I haven’t noticed any law enforcement
so maybe cops were also banned. In that case
who enforces the gun ban?