Depends on the kind of nerd. I wish I were a typography nerd, it's one of my weaknesses. On the other hand, I actually have written more than my fair share of COBOL74 on an old greenscreen, and if I had to do that in a beautiful typographical font, I would have killed someone.
Sure, I guess “accident” is a vague way of putting it. I mean monospace sucks, but it sucked in a way that people could take advantage of until they relied on it. Now that we have ncurses, it’s hard to call it an accident.
I could complain the same way about practically anything. Cement. Unix. C. The genitive absolute. But granted that great things are made out of hacks, some hacks are uglier than others, and monospace is pretty darn ugly.
Everything sucks, but Unix and C certainly don't suck less. I'd rather stab myself in the eyes with rusted forks than profess my love for either.
C is an overgrown assembly language, and Unix doesn't have enough kitchen sinkery going on to make all of the tiny programs that do one thing well even marginally useful.
Monospace isn't entirely an accident.