Just on the legal system, no-one is assumed guilty unless they plead guilty. Sometimes people do pleas guilty rather than risk a trial if the charged offence carries a potential custodial sentence as a sentence will be reduced for an early guilty plea.
Whatever you think of this, it's not a new phenomena, it's been part of our judicial system for a very long time.
Yes, I know the CPS have been tweeting some twaddle about criminals. They're idiots.