Lets try to speak as adults about this.

1) There are at least 403 cases registered of Fukushima residents developing Thyroid cancers after 2011 and the study is still ongoing. This is five times the expected cancer ratio.

Of those at least 155 cases of malignant cancers happened in children (Sokawa 2024). We know that thyroid cancers are rare among young people... except in one special place were a sudden increase in similar cases was registered since the 80's. This place is called Chernobyl. Children that lived in towns around Fukushima daichi where the accident happened have three times more probability of suffering thyroid cancer than children that lived in towns farther from the plant.

2) Not the strong excuse that it seems, after the company was warned by scientists about the possibility of such earthquake and the urgency to improve their safety measures. They had a lot of time to fix it, and did absolutely nothing