Who is the murderer?

---The Poetic response to "The metaphor " by Budge Wilson

I killed a person

Indirectly

My parents, classmates and friends were the accomplices

I knew that we were all guilty

But we wouldn't say it out loud

Always there were some secrets

Graves were the only place where they deserve to go

Miss Hancock was my English and writing teacher

Also, She was the victim who died in the accident

Her body was toss to heaven by a speeding car

Then fell heavily into the hell

I knew she was the person

Who liked give others a hand

Who guided the lost kids to the right path

Who lighted a fire selflessly in the dark

Should not survive in this filthy world

All because this filthy world loved to tarnish the most innocent things into the evilest 

I killed a person 

And I started feeling regret

But, Wait a second!

Actually

If we were all guilty

Who says that I was the only murderer?

Why should I needed to be made a scapegoat for Miss Hancock's death?

All of us got the motivations

Therefore

Who is the murderer?