That's certainly an interesting take. Would you say the same thing about poor people that are earning their living as a result of war or other things that negatively impact the planet as a whole?
People should be allowed to engage in dirty, risky behaviour if it's their own choice. That covers the act of working in e-waste individually, as for any pollution it causes it's up to the authorities in Ghana to deal with that, but it could be that they feel the decrease in poverty of those engaged in e-waste outweighs the problem of pollution. That's for Ghana to decide though not us.