I have been thinkin' hard,

False accusation is lying, and if women testify in court, and lie under oath, then that should count as perjury, and should be automatically punishable.

We shouldn't need new anti-false-accusation laws.

Perjury, i.e lying to the court under oath, to mislead the course of justice, is already a seriously punishable offense, and can sometimes carry a jail sentence of 7 to 10 years.

So why isn't this being used to punish false-accusers?