I love this. But it should also be said that if a mouse is in the process of putting the bell on the cat, other mice should shut up and get out of the way.

In my experience, the same people that have ideas similar to belling the cat, are the same people that are major critics and with opinions about how something can't be done even though someone is actively in the process of doing it.

I guess the moral is about how ideas and opinions (positive or negative) are empty when one is unwilling to be involved in their implementation.