> but if I understand you correctly you did not have it when you made your first post

correct

> It is therefore inadmissible evidence as to whether your first post was a reasonable thing to write.

Completely wrong. I approximated the lowest part of a logistic function with e^x, which is reasonable for small values. Given it matched well with professional epidemiologists' graphs, it suggests I'm getting it approximately right.

> whose responsibility is it to fulfill that desire?

Mine and yours. Don't stick 'reasonable' on your replies and suppose it insures you in any way cos it doesn't.