The key to happiness is to avoid stressful situations and do happy things instead of watching sad things or hearing sad news.
I quit watching the news on TV and viewing news online a few years ago now and I've noticed I've been happier and less stressed out.
Whenever I would watch the news or view the news online there would always be some tragedy that was happening and It bothered me to hear about it.
For example kids getting killed in car crashes, murders etc it all saddened me and I could not stop thinking about those stories which kept me up at night a lot.
After no longer watching the news viewing the news I sleep better because I don't worry about those things that I cannot control.