Same argument as JPEGs on Bitcoin, if it's going to happen anyway, I might as well not bother to do anything.
Debit card fees are normally cheaper for the merchant than credit card fees. Cash is free, although some banks charge merchants to deposit cash these days and other countries are making large amounts of cash illegal.
We're supposed to be the good guys, changing the system for the better, not ambivalent to it.
6% of $1M is $60,000
6% of your $4 coffee is $0.24
They look different, but they are the same.