Why do they have live audiences at the presidential debates?

Whoever thought that was a good idea? Makes for a circus atmosphere. In the recent GOP debate, when Christie rightly criticized Trump a few neanderthals in the audience booed loudly. In the Democratic debates for the 2020 election, some idiots booed Kamala Harris when her record as prosecutor was brought up; unfortunately she caved and made excuses instead of owning it and stating that it had been in fact her job to do what she did.

Why do they have live audiences at the presidential debates?
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