never been suspected of a crime or misconduct myself, but i do know some very serious liars including two who faked cancer so i know lying happens.
just so we're on the same page here: false accusations means deliberately lying.
if the accuser genuinely believes xyz happened, it is not false accusations. also not having enough evidence is not false accusations and does not mean the accuser is ‘proven wrong’ if they lose their case; it just means they had a weak argument.
1) if you meant should be doing more, i would say realistically we can't stop people lying to authorities; it's their choice. children lie. second sin of all time was lying; see genesis.
we discourage people from making false accusations tho by making civil suits and criminal prosecutions - virtually impossible. google the cost of hiring a solicitor for a lawsuit - it's outrageous. farrrr too expensive for an average person to make a good claim, let alone for a frivilous one. and no, legal aid is not 'free' or easy to get and will not cover sally if she wants to sue joey for grabbing her ass during shift at poundland.
on the criminal side, it's the standard of proof that protects the accused, which is extremely high - beyond reasonable doubt means jury must be 99% certain, which many people underestimate. standard so high that consequently very few criminal investigations result in charges; fact it's the default they won't (5.7% of all crimes reported to the police lead to charges 2022-23).
charge rates for crimes typically associated with 'women lying':
rape reports - about 1-3%
stalking and harassment offences - 3.4%
domestically abuse - 6.7%
that's just charges, not convictions. investigation to charge takes like 6+ months and if you want conviction in court takes another 1-2 years after charges. you'd have to be a proper nutter masochist if you're willing to go through all that just for ***** and giggles, especially if you know how rare it is to secure a conviction. only a nutter would look at that and think 'wow i stand a really good chance here, i should make up a story and call the police!'.
i have sources for further reading. happy to post
2) i don't know what you're asking here to be honest.
3) perverting the course of justice means prison sentence up to term of life improvement. is life imprisonment likely? no ofc not, but neither is rape.
it’s not possible to be tit for tat tho cuz sentencing is dependent upon the defendant specifically after their own personal aggravating/mitigating factors are taken into account.
4) what purpose would that serve?
you know that there is no special centrally held register of sex offenders in England and Wales, right? the name 'the sex offender register' is merely used to describe a system whereby offenders register their details with the police, so police can check on em make sure they're not perving on anyone. there is no general public access to it tho, so can't look up your employee or tinder date on it. want to reduce the risk of being falsely accused of rape, save sex for long-term partner or ask your date for a dbs check.