rm -rf / OUCH

I know it's to late now but try this
alias rmi='rm -i'

stick it in the ~/.bashrc file that way it will always be active run
source ~/.bashrc
You only need that if you want to make the alias active in the current session.

Get used to using rmi to remove files I find it a good idea not to alias rm='rm -i' as you get using to it then you log into some other box that does not have the alias and disaster can strike.

I feel your pain
Dave