Robustness - Review of note - do we need an assumption section?

The WG knows that the user agent operates in a risk prone environment.
We note items that are out of scope, but I don't see anything that
states an expectation that the user agent requires a reliable platform.
 
It is assumed that is that the user agent is operating on a platform
that is functioning correctly. Since the web is a risk prone
environment the user must take precautions implementing defense in
depth techniques that include network, application and OS controls to
ensure that the operating environment is reliable and will correctly
interpret user and user agent requests.
 
Bill D.