How to use "Karma"?

If anybody understands 'Karma' in Indian caste system then they would be reasonably aware that it's an inhuman concept to justify the hereditary caste identities and can only be used negatively.

Good usage:
This comment at Salon:

I am now quite sure that the trolls are going to proclaim that this is impossible, and that any research against their notion that fat people are lazy and gluttonous must be wrong. Because they are so smug and self-satisfied in their not-fat bodies. I just hope Karma is a real thing and they pay for their attitudes in their next life.

Bad usage:
Satya Nadella of Microsoft:

 But take Nadella’s word for it: Good things come to women who don’t ask.“That might be one of the initial ‘super powers’ that, quite frankly, women [who] don’t ask for a raise have,” he added. “It’s good karma. It will come back.”