There are two good reasons why 1. It's very difficult to tell what's a good idea or not. 'Not Invented Here' syndrome is one reason why we think other people's

There are two good reasons why 1. It's very difficult to tell what's a good idea or not. 'Not Invented Here' syndrome is one reason why we think other people's ideas generally suck, but in the end it's almost all down to execution. 2. Startups are hard. It's much more useful to start out gung-ho with a crummy idea, and then learn exactly why it's crummy and adapt than to be shot down before take-off because the idea isn't perfect. and one slightly less good reason: 3. We want people to like us. It's hard to break down an idea and not breed any resentment.