It's easy to find issues in laws with some brainstorming over a pizza. The problem is people pushing certain laws frequently don't give a damn about side effects. Why would they care about results coming out from a simulation?
It is easy to find theoretical issues through brainstorming, but weeding out the false positives is much less easy.
As an example, religious conservatives will brainstorm a lot of issues that are bound to rise (according to them) from gay emancipation. In practice, these failed to manifest.
You can easily manipulate results in a lab test too by messing with the environment and cherry picking results. And focusing on different outcomes.
I'm pretty sure same religious conservatives will claim that issues they saw did come up. While the other extreme would just shrug off the same issues as non-issue. Different people value different things... More at 11.
