If polls are so reliable, why do we need to bother with voting?

Source::
The National
If polls are so reliable, why do we need to bother with voting?

PHEW, that was close. According to one opinion poll the Alba party’s been written off already. With polls held in such high esteem one wonders why there was ever any need for elections – or referendums for that matter. Perhaps a poll of polls might be more accurate than the +/- 3% error of just one, or maybe it would magnify the error. Sadly the pollsters and their followers have a higher degree of confidence than they do of accuracy.

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The National
If polls are so reliable, why do we need to bother with voting?