I just read a large Twitter thread from someone working for organisations helping in case of disasters and she explained why Musk's ivolvement was so toxic. The things helpers hate more than anything is unnecessary attention and influence from the outside, and celebrities trying to help and diverting any ressources away from the immediate rescue effort having possibly tragic effects. What if some influential Thai authority liked that a celeb such as Musk wanted to insert himself and wanted to rather go with his plan because, hey, it's Elon Musk after all, torpeduing the immediate rescue effor that was already on its way. You can be absolutely guaranteed that the divers and personel already busy saving these children had to spent several hours arguing with people about the Musk issue. It's a disctraction that obviously nobody wants to call out - it IS Elon Musk after all and he just wants to help - but it's still a distraction and one that could have tragic consequences if the wrong person would have gotten enarmoured by it.
If anyone has that thread on hand, would be very thankful for a link.