[wongarsu]

Windows is a multiuser system and tries to give you a reliable security barrier between two (non-admin) users. And at least since Windows Vista it puts some effort into preventing non-elevated software from gaining admin rights, limiting the amount of damage it can do somewhat.

Of course in reality installing any untrusted software on a computer that's not airgapped from everything you care about isn't safe. But that doesn't mean we shouldn't at least try to give better security guarantees.