Buddhism and the surrounding environment
I think you will end up getting better answers to your question. But I'll answer what I can. :)

It truly is exhausting to be in a mind state of continually judging every experience and every facet of life as positive or negative and trying to continually change things to be as you would have them. One of the reasons people come to mediation is because they realize they can't change the world and they want to learn to live in the world in a way that causes less suffering for themselves and others.

Meditation is something an individual does but because of the way it changes the individual; it also changes things in the individual's world. Spending time in meditation can help a meditator to become very aware of things they are doing which are causing suffering for themselves and others. It can help one to realize that suffering comes internally by identifying things as me and mine and trying desperately to prop up that fragile ego of me and mine.

The relief of learning to loosen the grip of needing to have everything under your control and everything to your liking is tremendous. I don't think it can be properly explained; it's something that needs to be experienced.

If you are concerned that meditating will make you indifferent to the needs of others, I can only say that because you are, examining your own mind when you meditate, you really can't hide anything from yourself. So if you are doing something that causes suffering to others, it'll be clear and you won't want to continue.