The subprime mortgage crisis was caused by hedge funds, banks, and insurance companies. The first two created mortgage-backed securities. The insurance companies covered them with credit default swaps. Demand for mortgages led to an asset bubble in housing.
The field of dielectrics is a branch of physics that covers how insulating materials separate different electrical charges in a capacitor. A capacitor is a device with two metal plates of opposite charges, with a dielectric insulating material in between the keeps the charges separate.
Some complaints claim dielectric grease is conductive or abrasive, containing silica that increases wear. (It doesn't contain silica). The most frequent Internet complaint is that dielectric grease insulates connections, making connections less conductive. The general basis for this claim is in the word dielectric used in the name. The word dielectric is assumed to mean the connection will have future problems because dielectrics are insulators.