One could extend that kind of reasoning to a number of so-called "legal" products and services being sold today.

Either directly or indirectly (degrees of separation), many simple acts of commerce fund things most would find abhorrent.

Diamonds are most definitely on that list still - despite all the noise and promises made; I am fairly certain so-called "blood diamonds" are still a part of the trade.

Gasoline (more concretely, oil) is another.

It wouldn't surprise me to find out that various renewables have their own problems in a similar vein...

You can probably think of others.