Who can stop them?

If someone has taken revenge that they will do something then there is no one which can stop them!
Its always we can guide them they can't be stopped forcefully!
Let i give u example - Someone has deactivated his/her account on facebook.
then he/she would feel that everyone thinking that they are not in touch with anyone
but this never happens!
This is modern world. People thinking starts when their thinking ends
They can chat on YAHOO MESSENGER or on any messenger or on any other site....
But then who is there to stop them?
The answer is no one! So one can be guided only but we can't stop anyone forcefully and if he/she has taken revenge to do that then we are failed against this!