I often remember a pilot telling me about taking off from HKG on the way back to LHR. Just after take off a warning appeared saying one main gear tyre had gently deflated. They consulted with HQ and chose to continue to Heathrow because landing back at HKG with one tyre out in a heavy aircraft was more risk than landing at LHR in a much lighter aircraft. The real question was not whether to tell the pax that the tire had deflated but what to tell them on approach to Heathrow. After all, regulations called for fire trucks etc to be available. Again, a debate, do we alarm the passengers or say nothing? He chose to say nothing until, on the ground and surrounded by flashing blue lights, he simply acknowledged that the lights were for them but since they were on the ground and taxying to the terminal all was ok.
It's one of those many decisions that pilots are paid to make and the dividing line between saying enough and too much is sometimes a fine one.