I eat wasabi and put stuff on it

Nigiri is 2/3 shari (rice), 1/3 neta (topping), so... But the issue with sushi is not what they put in the rice, but the fish most places use, especially the adulterated tuna most (and by most I mean 90% in the US and Europe) serve.

I happen to work in fish, and in the sushi industry specifically, so believe me.