Personally I don't think the presentation ruined anything. In my mind, it's still vague and ambiguous, regardless of what Geralt can think. ›››
I don't know if I agree - it felt like exposition, and as most other such cutscenes are just that, I'm finding it hard to read into it that CDPR intends for the "truth" to be left unknown; I felt they gave it to us there, plain and simple.
But imo, the issue is much bigger and much more interesting than whether he was really guilty or not. That point became more or less inconsequential. ›››
This is very true, though! When you're faced with that choice, you don't really stop and think "Is he guilty or not?" but rather what it would entail if he (a prince) was allowed to be lynched by a group of angry peasants. Oh, the speculation on the ramifications this would bring! It's obvious that it is not what Saskia would have wanted, and a lynched prince at the hands of commoners, would most likely cause severe problems for the intended Free Pontar, down the road.