It is true we have treat accept them as being innocent Chilled. Also the presumption that people are innocent until proven guilty is a better way than the alternative . We all have to accept the decision of a jury in practice, and often they will be right.
I would not accuse someone of being guilty after they were acquitted of a rape charge. If I personally knew an alleged victim though I might believe them rather than the person acquitted of raping them.
A verdict does not always reflect the truth.
It may be so difficult to prove that a person did not give consent, especially in an acquaintance rape case, that a jury has to acquit. That does not always mean the acquitted person is innocent.
The prosecution barrister could be less skilled than the defence barrister.
The jury, the prosecution and the judge could lack understanding about rape victims. Most people do not report rapes because they know they will not be believed.
Apparently conviction rates for rapes are far lower than for other crimes.(Rape Crisis Centre).
So I do think it is likely that among all the acquitted people who have been charged with rape, some will be guilty. On the other hand, among the convicted some may be innocent. As things stand the former is probably most frequently the case though.
The system does not always get it right.
One thing is clear in this case is that the men published their film on social media:
He [the judge]formally discharged Duff, Mahon, Foster and Martin but warned them to be careful of their actions on social media.
He also told their counsel to tell the men: "Remind them of the very careful path they tread." The Bath Chronicle
The BBC said 11th April
"Four men accused of rape after a university's summer ball have been cleared after the case against them was dropped."
"The decision was made that there was no longer a reasonable prospect of conviction and therefore in the circumstances it was not for the Crown to pursue this case to trial," (Prosecutor Fiona Elder)