Did your statement about needing a guide within the marine park also impute "...for night dives"?
Of course not, since statements can't impute things. It implied it. It should be easy to impute that, since the requirement is not limited to daytime. I didn't specify that, because I thought it'd be completely unnecessary.
No one was asking you to advocate night shore diving.
Nobody asked you to, either. You shared your opinion. I shared mine. That's what ScubaBoard is for. We're allowed to disagree about whether shore diving at night on Cozumel is advisable.