Ideas are often shot down an killed before they are even fully born. So often someone comes up with a thought, a glimmer, which, with a bit of massaging, could turn into something worth consideration, but is not even considered because someone else immediately sees a potential flaw.
We are all so used to being fast, and not only having the answer, but having it FIRST:
"It’s like I had to be first with an opinion – as if being first meant something. But what it really meant was that I wasn’t thinking hard enough about the problem. The faster you react, the less you think. Not always, but often."
So, next time someone offers an idea, or even the start of what could be an idea - give it a minute.