OrganOfCorti's post seems to focus upon mathematics, yours seems to focus upon hysteria.
Dude, I posted a
link. Who's the hysterical one here again?
A link, coupled with a statement implying that the material in the link was applicable to the particular 75% fork threshold being discussed, and that it necessarily indicated a 'problem':
If you are really interested in why 75% is not enough, the definitive answer...