I'm in a highly regulated/high consequence-of-failure industry and its often a defense mechanism. A way to contribute without contributing, or a way to provide

I'm in a highly regulated/high consequence-of-failure industry and its often a defense mechanism. A way to contribute without contributing, or a way to provide input without being held accountable for that input. People will endlessly speculate about other options, or criticize a decision with no input on a viable path forward. I'll let it go for a bit, but eventually its time to hold their feet to the fire: "I require positive confirmation that you accept decision X; or for you to clearly define an alternative path. If I do not receive an answer by <date>, I will consider that acceptance of X".