There’s the odd off license that only takes cash. My card might not work for whatever silly reason. I usually carry £1 or 2 (separately from my wallet) for the off chance of running into a beggar.
I’m also on my way to the library at the moment, where the foreign language talking class costs £2 in cash.
Nah, I’m sorry but I don’t think it would be fair and ethical to call for their sudden death.