"And so kind for some"
You got that completely wrong, there's no human being that got a perfect life no matter how happy they might seem, their "happiness", "money", or anything else doesn't really mean that they don't go through some hard and unfair situations/problems sometimes. You can see someone who doesn't have any financial problems, but that person might still lack something else (friends and a family for example).
It's sometimes a "test".
Just smile and be grateful for what you have before it's too late.