Push me down
and I'll grow.
Confess our secret
and I'll go.I am the one
that hides within
the silencer known
as the guillotine.I punish the
ones with heart
and strip away
their mirth.Only talk to me
if you are insane.
I'm dangerous, but
clearly not inane.Who am I?
Hint 1
I am a form e when set in motion.
Hint 2
I lay concealed in another form in the title