The devil doesn't need advocates.
All ideas are flawed.
All of them.
You could poke holes in any artistic project.
Any of them.
We have enough of that. The internet is full of that. Our society doesn't lack people who are willing to take an idea or an intention and rip it to shreds.
What we need (what you need, what I need) are people who can see the possibility in our ideas (even the stupid ones).
We also need YOU to be one of those people. Don't be afraid to praise. Don't be afraid to try and improve an idea. Don't be afraid to believe.
We don't need the burnouts, the cynics, the people who (secretly) delight when people shoot for the moon and fail.
Get those people out of your circle, out of your organization, off your Board of Directors.
Energy, positive energy, is way more important then you think. Embrace those who deliver that energy, even when they are being critical.
Let the rest go.