This is nothing new, and this type of thing has been discussed in Canada as well. The fact is that Fukushima is still spewing massive amounts of radiation into the air and water, and no one has done anything to stop it. There are reports of other radioactive sources around the US as well, mostly leaking reactors.
The idea here is to not alarm the public. If you raise the safe radiation limit, then you don’t have to tell the public that radiation is on the rise. Hope you got your iodine!