prof Steven Keen wrote an interesting article on Patreon which he called the "Fisher's Paradox",

"...if the over-indebtedness with which we started (the crisis) was great enough, the liquidation of debts cannot keep up with the fall of prices which it causes. In that case, the liquidation defeats itself. While it diminishes the number of dollars owed, it may not do so as fast as it increases the value of each dollar owed."

My guess is that $90 Trillion dollars qualifties as over-indebtedness....:) So raising interest rates would smiply be economical suicide.