maybe teach them to use the handbrake rather than sit with their foot on the brake pedal when in traffic or at lights.
I don't think that's very good advice. If you keep your foot on the brake at lights, the lit-up rear lights give more of a chance for the distracted and clueless to spot stationary traffic ahead. If they plough on regardless, you're less likely to have them shove you into the car in front, or into the junction.
I wouldn't compromise my safety just to ensure that an LED light that oughtn't to fail doesn't fail.