Yes. Sometimes people can put aside their feelings and their kindness and consideration could still spread happiness.
yes, look at princess Diana and what she managed to do.
Yes... Heard joke once: Man goes to doctor. Says he's depressed. Says life seems harsh and cruel. Says he feels all alone in a threatening world where what lies ahead is vague and uncertain. Doctor says "Treatment is simple. Great clown Pagliacci is in town tonight. Go and see him. That should pick you up." Man bursts into tears. Says "But Doctor... I am Pagliacci."
To some extent, yeah.
It is difficult, but not impossible. The unhappy person must be able to shift his or her focus from self to the needs of the other and then it can happen.
a false illusion of happiness, yes.....