[mrout]

If you run them as a different user from yourself, maybe, but who does that?

The idea that software is secure if it only runs on your own user account is stupid IMO. I'd rather that software had access to everything on my computer EXCEPT my personal files.

[mnm2]

It's about restricting access: One is protecting others; The second is protection within your own realm. Both are needed (Unix was just like: At least don't touch the data / system that other users have)