Can you please reconcile something to me: Kissmetrics operates in a most ethical fashion but they prevent deletion of cookies in order to track my browsing? Do

Can you please reconcile something to me: Kissmetrics operates in a most ethical fashion but they prevent deletion of cookies in order to track my browsing? Do they think I'm stupid? Or let me ask the other way: Is it ethical to prevent deletion of cookies in order to track my browsing and intentionally hide the fact that they are doing that?