Comment 2 for bug 455579

>You using sudo here, right?

No I didn't use sudo... I used su and was root all the time.
You can repodruce it:
# su
# rm -r ~/.config/bleachbit (I didn't type .config/ here because of the damage if you just copy it, if .config doesn't exist it also gets UID 100)
# bleachbit
# ls -lisa ~/.config/ | grep bleachbit
And you see the owner UID 100

>UID 100 should still not be able to access /root/.config/bleachbit/ because /root/ has permissions 0700.

Ok, you're right here ;)
But it's just not right to leave that as it is. No one except root itself should own a file in /root