Did you not have to hit an ok/next button once you marked the partition to be formatted? That is the confirmation.
I find nothing more annoying then the:
me> del blah
system> Are you sure you want to delete blah?
system> Are you really sure you wanted to delete blah?
In general, in Linux, the system does what you tell it to do. They assume you are making intelligent decisions. That is why I don't run as root after I've been at the pub. RUI is a crime and is no joke.
PS. RUI = Rooting Under the Influence