Let's make a policy. The policy goes like this:
"If an administrator speedily deletes an article and it then turns out that the article in question was not a real candidate for speedy deletion, that administrator is awarded a point.
If an administrator gets more than 3 points during a 3 months period, that administrator loses admin privilegies."
Unfair; sysops who do a lot of speedy deletions are more likely to be awarded "points".
It's the ratio of mistakes to good actions that counts, not the number of mistakes.