Analysis of punching bag

I destroy people for a living
with no regret,
there's no forgiving
no need to be justified
they turn their backs,
you sink your knife
I'll be the grim
the sharpened reaper
and here...
now you can be
my brother's keeper

It took more guts for me to blow my brains
More than any *ss you nailed or saved
It took more guts to end my life
than you gave
on any day
to labor and strife
Where is the reward in continuing?
I cut my wrists
and then you ring...

So what's the bloody point in this?
I kiss your tail,
you clench my fists
"Just go ahead hit me, will you?"
clearly
it's not me
who wants to kill you