He is a part of why they are dropping. Disinformation, nothing really offered to comfort anyone during this crysis, and when you use manuevers meant to help a falling economy to artificially keep an economy/stock market up, you end up with no options and no trust when stuff like this happens.
What is out of his control is global economy as a whole which directly effects ours, and other governments hopefully take steps to control what they can with their economy.
So, is he fully responsible, no. Does he play a part in it. Yes.