Icarus I didn't realise you only flew lighties. Jet transport aircraft have two wx radars, if one goes u/s the MEL allows flight into areas of TS and turbulence provided the other one is seviceable. Only an idiot would despatch with one serviceable because if the other one goes cactus you're in the smuck !
Claret think about it Mate! You already stated
The No1 CC and F/O and I discussed the pros and cons of an enroute 'tech' diversion to prevent some poor soul soiling themselves,
..............if you had despatched with two toilets serviceable this would never had been a problem!
You didn't come up through the cadet scheme per chance? Don't let the MEL & bully QF management rule your life. Use common sense and think about the crew and passengers for a change.