He also killed Apple's wireless mouse development because he claimed that "nobody wants a wireless mouse." That's why Apple was one of the last to release a wireless mouse.

He was right most of the time, but not all of the time.

He also trashed the Macintosh project until the Lisa bombed, after which he loved it and promptly took it over (making it into Lisa 2 in the process).

That's just one example. Remember that when he returned to Apple, he killed most of the product lines.