It might be true that, for some legislators, the fear of speaking truth to this particular power is one of public disorder. I don't think there's evidence to support that fear, but that doesn't mean it's not a motivating factor.

A larger motivating factor - and this is pure speculation - might be more closely related to angering an institution with such a capacity for unchecked initiation of violence (ie, that ones person, home, or family may be in danger of direct violence).