It was pointed out to me a while back that the paradox of tolerance is only a paradox if you consider tolerance to be a philosophical position.
In fact, we don’t treat it like that. We treat it as a social contract, in which context it is no paradox at all to say that if you aren’t tolerant then other people aren’t obliged to tolerate you in turn
How did you calculate that? The question didn’t even mention a specific speed, just “near the speed of light”.
The kinetic energy for a grain of sand near the speed of light is somewhere between “quite a lot” and “literally infinity” (which is, in a sense, the reason you can’t actually reach light speed without a way to supply infinite energy).