Would We See the Aliens Coming?

I really enjoy your combination of knowledge + humour! Thank you for dedicating your time to educate and make science more approachable. As per the energy heat detection I recently read that an advance civilisation (Kardashev II or III) has probably mastered technology capable of hiding such heat, which could explain why after scanning the universe for decades we still haven't found a single trace of advance technology.

No alien would land here for fear of being contaminated with our stupidity...