This question needs to be understood in terms of context and is very difficult to answer in a general sense because we all react differently to different events and happenings. For example if I saw people crying at a funeral I'd think that quite normal. If I saw the same people crying because a butterfly had died I'd consider that one step beyond and call that response overly sentimental. I might call it foolish.
If I saw a crowd of people laughing at a slapstick comedian on stage that'd be ok. The same crowd laughing at an old man tripping over his feet and falling flat on his face I'd say were being cruel.
You have to have a balance in your emotional life or you risk bubbling up out of control and losing sight of the rational; then again you can't be too inexpressive or you'll shrivel up inside and turn into a dry shell of a former self, incapable of true joy or genuine compassion.
Sometimes it's interesting to see how a nation reacts emotionally, how their culture and politics have influenced the way a people express themselves. I recall the death of Princess Diana in the UK and the incredible outpouring of grief there was for this 'People's Princess.' I thought it over the top, nothing but sentimental gushiness. Yet millions looked as if they were truly affected. Did I think them fools? No, but I was mighty puzzled.
Emotional energy can be an awesome tool for success and goodness if channeled wisely but it can completely undermine a person's intelligence when it is false, born of insecurities and always seeking attention.