A lot of the wealth in the west was created in some rather dubious ways viz. colonies and slavery. I wonder whether that wealth would carry "bad karma" as well.

The simple truth is that without laws explicitly forbidding businesses from engaging in such practices, the market WILL force them to engage in them. So we change the market using regulations to prevent such sort of a thing.

Do you have any source of these sub standard working conditions? I did a quick google search on HCL offices: https://www.google.com/search?q=hcl+offices&client=ubuntu&hs...

Or are you talking about work culture?

Sub-standard working conditions are a thing in the US too. A common thing.

Worker rights are overall very weak in most industries across the US.