What a silly choice of words. Irresponsible? Really? Think about that for a little while.
There are other descriptions that could have worked okay in that sentence. But irresponsible?
Oh, come on... You don't really know that for a fact...
No one knows. It's a million people trading and more wanted to sell than buy, so the sellers had to lower their prices until the buyers were willing to buy.
Money, it's a gas