Signing things is only relevant within a bubble of trust where you just want to know that the Fred you're dealing with is the Fred you already previously knew a

Signing things is only relevant within a bubble of trust where you just want to know that the Fred you're dealing with is the Fred you already previously knew and trusted. "Out there in the real world", among people who work and spend money and vote and hold offices and sue and buy guns and raise kids and consume consume consume and couldn't be paid to care about your cryptographic signature, this solves absolutely nothing while dangerously pretending that the legitimate problems don't really exist or aren't really serious.