Wait what? Public opinion surveys (if that's what you meant) are absolutely still subject to error. This is especially due to getting a representative mix of all of the different populations.
Even without those issues, you still have the issue of people you survey not telling the whole truth... or surveys being poorly designed so that the question people think they are answering is not what was really being asked.
Data is hard. Just because you have some survey data and (maybe) did something statistical doesn't at all mean you should listen to it.
Even without those issues, you still have the issue of people you survey not telling the whole truth... or surveys being poorly designed so that the question people think they are answering is not what was really being asked.
Data is hard. Just because you have some survey data and (maybe) did something statistical doesn't at all mean you should listen to it.