Nihang Singhs eat jhatka meat because of their traditions. The
guru allowed this tradition of jhatka to be practiced within his
army and by his soldiers; it wasn't for civilians to eat. Maharaj
said to them that if need be you may jhatka and eat it, not just
goats and chickens ut any animal you may find in the jungle. The
nihang singhs of today still folow this tradition. When performing
jhatka on a goat first the goat is bathed then japji sahib and
chandi di vaar are read. One singh stands by the head of the goat
and upon the final lines of chandi di vaar being read 'those who
sing this divine ballad will be liberated from the realm of life
and death', at this moment the goat is decapitated with one blow
and the soul of the goat is liberated. The goat itself lowers it
head to receive salvation.