I'm going to shoot down the inconsistencies of an idea.
In what ways is the idea inconsistent?
There's a lot of inconsistencies that are too long to discuss but I am just ready to shoot it down.
If you think an idea is wrong for whatever reason, it's good to let the other person know about the issues with an idea so that they do not waste their time pursuing something that isn't going to work out. As long as you tell the other person respectfully and tactfully, there isn't anything wrong with letting them know that there are inconsistent parts to an idea and to look for better alternatives.
Nah, I like shooting flaws.
There are too many flaws in the world, shoot them all you desire. Maybe one day there will be perfection in everything.