I'd mind it if you told people that omitting semicolons causes cancer. (Or bugs.)
-- EDIT:
I just looked up your book to the point where you make this recommendation. You don't threaten any catastrophes, which is good. I disagree with the "complex and weird" conclusion, but it's certainly a valid decision to leave them out of the book if you'd rather not go into it.
My opinion of you: Not Evil. <3
Example: http://roboprogs.com/devel/2010.06.html
It's a shame they didn't just make it fully line oriented (like BASIC, xBASE, shell-script, Python, Ruby, ...), with the customary backslash or ampersand to indicate an incomplete line. (but they didn't) I guess then Netscape would have had to call it FooScript (or something silly like echhh-muh-script).
The worst thing I hate about the "add semicolons!" religion is that it teaches people not to spot statements that are going to be terminated by a newline. So then, I have to see all the extra noise on each line :-(
Don't people test the crap they write?!?