Questions to last a lifetime

When I was a teenager, I had it all figured out.  I thought of things in the abstract, and in the abstract, they were easier to solve.  Seems simple to say

• Let people do whatever they want as long as they don't hurt anyone.  Stop people from hurting others.
• Don't work so hard to earn money that you become cynical and stop being joyful and playful.
• Look to research to see what works to solve social problems, and then go out and fix the problems.

Now these things are not so simple.  It seems to me that a person could spend a lifetime struggling with such issues.  What seems simple in the abstract is far more complex in the implementation.