Pace/Flyingmac/RMK
With respect, I think you've missed the point. The OP has already made it perfectly plain in the thread title and subsequently in his post
#35:
Let's be clear here, I was asking what your thoughts are.
...that he was asking advice!
I don't think he said he was a curtain twitcher waiting to pounce on unsuspecting aviators, nor that he had any intention of reporting anybody or doing anything that might damage GA. He's not 'snooping', nor has he suggested that he's 'telling on every perceived misdemeanour'. He noticed something and asked what the PPRuNe community would do if it saw someone flying dangerously.
Whether this microlight chap was in the CTR/without or without permission/in breach of Rule 5/flying dangerously is not clear. However, if I saw someone wilfully flying dangerously i.e. risking injury or death to himself or others, then he deserves a good talking to at best, or reporting to the authorities at worst (or both). I'd expect exactly the same from any of my peers. Why protect an idiot whose dangerous behaviour is damaging GA?!