give him enough rope and he'll hang himself
self-annihilate
shoot oneself in the foot
fumble the bag
be one's own worst enemy
bite the hand that feeds one
menticide
self-guilt
self-abuse
self-destructively
fool's errand
make an ass of
self-destruct
saw off the branch one is sitting on
burn one's fingers
self-sabotage
make a fool of
exploit
felo-de-se
autonomousness
self-harm
mistake
self-delete
roaster
self-deletion
destruct
suicide
step forward
self-destruction
abstinence
tie someone's hands
abduction
mislead
self-renunciation
autodarwinate
wish one joy of it
make an exhibition of oneself
abandonment
unself
self-reliance
self-reproach
reap the whirlwind
scuttle
stand in one's own light
pay the penalty
cut off one's nose to spite one's face
fooling
voluntary
exploitation
leisure