Don't act so stupid. Do you have to be mentally ill to hurt somebody?
In a letter to a colleague, Benjamin Franklin said to hate someone for no reason is the sign of a sick mind. The colleague in question had written a latter to Franklin. Franklin did not reply fast enough, so the colleague sent Franklin a venom filled letter.
For the most part I agree with Franklin.
To hate someone or inflict harm upon someone else, the person may not be mentally ill, but they may have a sick mind.
Forms of mental illness are passed from one person to the other through our actions and words.
Bullies pick on weak kids, which makes the weak kids angry and bitter.
Hitlers hate filled speeches about the jews spread his anger to the masses.
Hate and anger are just as contagious as any infectious disease. Rather than being spread through bacteria or a virus, hate and anger are spread through our actions and words.