I believe that we have to be good from inside, and this world is full of mean people, who are neither good nor bad, they just want stuff for themselves only, to increase their profits at any cost.

So, to protect ourselves, our values, we need to see the world as it is.

We should help anyone we can, and at the same time don't sacrifice ourselves in doing so.

I always believed that it's not the people, but the situations that are hostile (except a few, who were always assholes).

As you have mentioned it already in your post that there is good and bad in everyone.

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Speaking of batman and joker, I always wondered since I was a kid that who is responsible for the people killed by Joker?

The Joker himself or the batman, because batman had many chances to kill joker, but he didn't killed him, just to protect his moral values.

So, in a way, batman was almost as evil as the joker was.

In our world, there are many batman and joker, they just don't wear the cape or the makeup.