Oh, ok. Well, if your attitude to the farmer is going to be telling him how to do his job then yes, probably better to say nothing.
However, I doubt he knowingly keeps valuable stock in a field where they are likely to come to harm - perhaps there's a field drain has bust under there, making it wetter and more dangerous than it would usually be. He probably does know he's got a bust drain, and probably has a plan as to when he'll fix it, but perhaps doesn't realise it has become boggy enough to be dangerous to the stirks. He'll see the mud on the legs and body of the one you pulled out, and will assume the stirk has been in the wet patch but has got out ok. So, if it were me, I would, without judgement and with humility, mention to him that the stirk had been stuck and that you and the neighbours got ropes on it to it to help it out.
By the way, did either your neighbours or yourself contact the farmer at the time to see if he wanted to come and help his own beast?