The released water has around 1500 Bq/kg. If you were to drink a cup of that water (not even diluted further), you’d get a dose of 0.375 mSv. That’s like 100 flight hours, or an x-ray (depends). Two months of just sitting at home will get you that dose.

The DPRK invaded the ROK, this is why the US got involved. Yes, the US has been in the wrong many times, but what you are claiming just isn’t true at all.