Yeah, how dare he try to help.
His idea was stupid and useless anyway. It just came off as if he wanted to play the hero and build a Batsub in his mansion to deploy it and rescue the stranded children.
A good idea now would be to send money to the family of the driver who died. That would be helpful.
Even if he did, he didn't interfere or impede rescue efforts and gave them a tool they could possible use in the future. It's cool and a nice thing to do, and doesn't really seem like a big deal.
And yeah, he probably doesn't have all the domain knowledge needed, but I reckon he had some help. Example; the 6 or so people seen on the video when they tested the tube.
I really can't see why people are bashing him. Yes, he was public about it, but he also created something that seems to work, and if it's a prototype, that prototype can be used for further development. It feels like nothing speeds up R&D like a crisis.