Snakes are creatures of God, like all of us are. This guy obviously had serious emotional problems. The death of his mother may have resulted in his inability to care for these creatures. 350 animals is beyond the ability of any one person to deal with.
Yes we should treat all animals with respect. Animals are not people though.
In this case you’re right, the snakes should have been killed respectfully.
People hate snakes for two reasons; fear and ignorance.
Since I have no use for cowards and fools, I no longer bother to ‘defend’ snakes.
YMMV.