In the article, the author discusses a number of other cancers (breast, brain...) that nitrosamines cause. Colon and rectal cancers are the most prevalent, but not at all the only ones. And... quality prosciutto and other pork belly products can be obtained from most local butchers without nitrites or nitrates, so you can avoid these things and still live very happily indeed with salty pork.

Also, the results of nitrosamines happen faster than I believe you expect from what you posted. Colon and rectal cancers have been on the rise for decades.

So, I see your point, but it's an uglier problem than I think you realize and there are some easy solutions available.