"If there is enough evidence to say they did it..."
Well who decides that? That's the whole point of a trial. Serious cases are heard in front of a jury in the Crown Court. A case would not get to Crown Court if the CPS did not believe that "there is enough evidence to say they did it..."
The CPS provides data on how many people get convicted etc and this is what they say:
In the 12 months to the end of December 2023 there were 69,553 completed prosecutions in the Crown Court of which 54,065 or 77.7% ended in a conviction.
That sounds like a lot of guilty people, right? So why are are barristers defending them you ask?
Well, if you look at the figures more closely, it turns out that of those 54,065 convictions, 49,059 had pleaded guilty. So there was no trial, it was just a case of the barrister pleading any mitigation.
So what about the other 20,000 cases (well, actually 69,553 - 49,059 = 20,494)? What happened there?
10,291 cases were dropped by the prosecution after the defendant had been charged. This happens for a variety of reasons but will include the defence team putting forward a defence which shows that there is not "...enough evidence to say they did it..."
And then 9,011 cases actually went to trial in front of a jury. I would guess that this is what you are most concerned about? Barristers defending a person in court.
Well, out of those 9,011 cases, there were 5,006 convictions. That is just 55%. So, for those cases actually going to trial in the Crown Court you have a 55/45 chance of being found guilty/not guilty.
When almost half of all defendants in a trial are found not guilty even though there was "...enough evidence to say they did it..." so that they were charged in the first place then this really does demonstrate the importance of defence barristers.
Source:
https://www.cps.gov.uk/publication/cps-data-summary-quarter-3-2023-2024
ps, the similar figures for magistrates courts show 343,894 completed prosecutions and 287,848 (83.7%) convictions.
Of those 287,848 convictions, 267,611 were guilty pleas.
There were 23,794 trials and, of those 14,903 (63%) ended in convictions.
People are a lot more likely to be found not guilty in a trial at the Crown Court in front of a jury rather than in a Magistrates Court