Just watch Russia blame Ukrainian Nazis if something goes wrong here.
https://www.reuters.com/world/europe/russia-without-evidence...
Thinking that putin is crazy is actually a result of talking about all this properly. Because no one in the world can find another explanation.
Chernobyl has been in Russian control since the second or third day of the war. Strategically it is a pathway between Kyiv and Russia. I doubt Russia wants to destroy it, it'll do way more harm to Russia than anyone else, but this is a war and infrastructure is being destroyed.