This has been discussed at length before on here. You must have missed it. 'Choice' is a privilege of the well off. US chicken will be cheap. Who has to buy cheap food?
I don't think that will bother those who see the very poor as underserving Maizie. However, their own choices may change and that will certainly bother them. If the country is flooded with cheap chicken some of our chicken farmers, who do stick to the current husbandry rules, will go out of business. The government will then have to decide whether to slacken our rules to the same as the USA rules so that our farmers can compete or our farmers chicken will become a very expensive niche market. Whatever happens, it will affect us all. Deep pockets may help but I bet they will be the first to grumble. After all, in their minds, life is for the 'deserving' well off.
I am quite sure we will have the currently right-wing nativists telling us that if we don't look after everyone we look after no one, at some point and we will be encouraged to Buy British, even if we can't afford it.
Army horses loose on London streets
To go through chemo therapy or choose not to?