You do realise that the rich don't fill their swimming pools with money, don't you? Savings are ultimately invested, either directly though stocks/bonds or indirectly when the bank loans out the funds in your account. Slashing interest rates cuts out this source of investment in the economy while creating speculative bubbles fuelled with malinvestment.
Economic leftists have a different conception of justice. Our economic heores are not idlers that live off past capital, but workers who earn current income. Hence inflation that includes income inflation and increases workers' incomes and reduces their debts is good. Hence low interest rates that allow them to borrow at the least cost to themselves is good.
Sure, encouraging people to rack up low cost debt is a great idea. It will help them purchase houses they otherwise couldn't afford. I'm sure there won't be any negative side effects to that /sarcasm