I figured you meant generally happy as one is happy in this world, as opposed to the unknowable true happiness of Heaven, and so I voted Yes.
Why? Because God wants us to be happy; He wants us to be happy in Him. I can only think that He wants us to be so fully accepting of His will, actual or permitted, that we can be happy even when we ourselves are suffering. I think that refusing to be happy would be showing a huge lack of gratitude to God for the good things He has given to us.
On a personal note, there have been times when i have suffered, small amounts, or for short periods of time. Would I have wanted my problem to suck all the joy out of the lives of those I love? Am I not called to love everyone?
I think that those who are able to show forth their joy in God are those who are best able to acccomplish certain things for God–others are called to do different things.
I think the main problem is that we need to do more *personally *to help people. I am not diminishing the role of alms-giving at all, but sometimes I think we forget that we need to do other things *as well. *