A piece full of fear that says 'always keep away'. I found it interesting. Some critiques:

'all this horrible acts' I think 'this' should read 'these' if i'm not mistaken

'mass murderer' do you mean 'mass' or 'massive'? Because it depends on what you meaned.
I enjoyed the flow.

I thought that this piece was a bit scary at first, then once I got towards the end I realized that you were referring to killing time. Perhaps bored too much? So when I got to the end it gave me a sense of relief. I was not sure what expect from this piece when i staryed read and im so glad i did read it. Well done with the rhymes, And also the flow.