also, it's easier to fight inflation because you can always increase the interest rate. With deflation once you reach zero there isn't anywhere realistically else to go. Negative interest rate have happened momentarily but it's not like the US fed can realistically set the rate to -1%

In the depths of the financial crisis in 2008/9 I remember Bernanke saying he would fly helicopters and drop bags of money if it came to that in order to fight deflation taking hold.