A passive heat pump can generate power below 100C. That’s still plenty warm enough to travel up a water column, across a cooling tank, and down to a closed loop or exit. +A turbine to capture the falling water.

No idea how much energy it can capture. It seems obvious? So probably not much.

I don’t think that’s any better. It creates a situation like “everyone is guilty, we just decide who to prosecute”

What kind of assassin carries an extra magazine?