Yes, don't criticize individuals, but I'm not sure if criticizing 'bad ideas' is a good idea. YCombinator literally don't get into providing a lot of advice on

Yes, don't criticize individuals, but I'm not sure if criticizing 'bad ideas' is a good idea. YCombinator literally don't get into providing a lot of advice on markets because it's just too difficult predict at the nascent stage. Bad policy, bad operations, bad code, yes. With ideas, there's so much that may need to be fleshed out, left uncommunicated. An idea is more of an 'inspiration' for something, not the thing itself. The older I get the less critical I am in that area, and I often try to be my own devil's advocate i.e. 'how could I make that work'? But I think I know what you mean. And yes, some ideas are just really bad.