Yes, how can we know that you're there IRL when you're not in this
forum? Or why should society be based on bigot certainties rather
than sensible, equitative doubt?* (end ecoanarchistobjective mode)
* the answer to this apparently profound question is that if people
stick to the suicide of thought and reason on the grounds of parity
and tolerance, then one day, nobody will be able to replace a lightbulb
because "we" will be all wondering if electricity exists or is it just
another subjective concept.