roadkill
Take care not to make statements so inaccurate they are effectively meaningless.
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"US white bread" isn't a singular brand and most brands don't "contain[s] a carcinogen"...
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You never mentioned what the carcinogen was. Probably because it would compromise your argument that "US white bread" as a whole contains it when it does not. (It's Potassium Bromate/Bromide (it's used interchangeably online sometimes), for those wondering.)
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It's not limited to white bread in where it can be used. It was an additive to flour in general.
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A lot of the fear mongering blogs, written by 'influencers' whose research consists of 10 seconds of Googling but not verifying a single fucking thing they write about, name brands that contain potassium bromate... but actually don't. Example: Wonder bread (https://wonderbread.ca/our_products/white-bread-675g/) Chex Mix. Looking up their ingredients list shows the item in question is not used at all. https://www.chexmix.com/products/chex-mix-traditional/
TLDR: Think before you repeat vague, meaningless shit next time.
BTW, You should look into the horrors of Dihydrogen Monoxide.