I can fully understand and agree with bird watchers not wanting nests disturbed or added stress levels to the parents.
However this was not the case in this instance. This photo is heavily cropped from 560mm on the R5. Exif data says it was 64 to 84 metres to the focus point and my guess would have been in that range. I was taking photos from a popular public viewing platform on the edge of an old volcanic vent. A lady from a local bird watching group was there and directed me, and others, to where the nest was. I was able to clarify for her records that there were three eggs as she could only make out two.
So I don't consider myself a "rule breaker" or brave.
I hope you enjoyed the photo, it is also the first time I have time seen a falcon nest in real life.