These shoes are doing the same thing Coronavirus is doing.
Destroying the oblivious.
In a world where mitigating risk is key (don't fly on a helicopter on a very clouyd day that's grounded all LAPD helicopters, for example), both the shoes and the virus are basically innocuous, UNLESS you're susceptible.
Knowing if you're susceptible is the trick, and those who don't get it, well, they get it!