never get your happiness at the cost of unhappiness of others

we are all born kind . no one wants to do evils at first and they agree with the statement very much that "never get your happiness at the cost of unhappiness of others". but in fact someone always practice it without consciousness.do you remember the message or blogs from your friend which you must transmit ,or you and your families will be cursed if you see it.  i don't like these message and the one who send it to me. if i pay attention to the message that means i care about you. but the result is being cursed. so disappointting! do you really believe the curse? if you don't do that as it told you , would the doom happen to you? it is the economic goal forcing you transmit the message. and you are fooled with your clear wise and go on cursing your friend who care about you so much! how can you reponse the care with curse? though you are happy , the result is full of troubles.when i meet it , first i wouldn't transmit it and be fooled again , and then it leads to the hate to the very friend.