You're happy when your loved ones are happy.
Parents are happy to see their child happy.
A man happy to see his lady happy.
A girl happy to see her best-friend happy.
But, to what extent?
If your child is happy to eat junk food everyday, will you allow that just for the sake of happiness?
If you lady is spending beyond affordability, that nothing else left to lived on, will you let that pass in the name of happiness?
If a close friend of yours getting "peace" on drugs and alcohol, will you agree on it because he/she is happy doing it?
To a certain extent, happiness is not a right. Its a privilege.