Is it normal to want to tell complete stranger i see to "have a wonderful day"?

I don't mean, "Hey, bro have a good day", then walk off leaving them confused. I mean to actually throw fear to the wind and speak to perfect strangers and tell them, "It's alright. Whatever you're going through will pass as long as you keep living. Good times will be short and few but I'm sure that promise will come come true. I know this is true because I've had my share of sucky years. They aren't as bad of yours. Trust me. I know. Your life is tougher and I respect you for that."

To my honest opinion you bloggers are going to lie to yourselves. Even I'm lying to myself because I don't know if I would do it everytime but I feel like I want to when I see someone serving food look down I try to make them laugh. I don't think I'd put my life at risk to spread the message. I'm not a saint. I'm a mean person. If I was allowed I'd push someone over but then I'd apologize for doing something so selfish.