Edit to clarify my point:
should we erase from history books accounts of baseless accusations of prominent people? People accused of being witches, accused of being traitors because they subscribed to the wrong beliefs etc.
Regarding Clarke, I can easily imagine people having a beef with his (also alleged!) homosexuality prefer to smear him as a paedophile. Indeed the term is used interchangeably by many to this day, by malice or lack of knowledge or both.
If he actually was one, well we may never know. Knowing the nature of mankind, he would not be the first. But we have not been presented with evidence of wrongdoing, so, the allegations are baseless.
This is the classic example of: "Out of ignorance comes certainty."
You're essentially saying that because you cannot explain the behavior of one individual, then the explanation is likely/must be X.
You don't know = ignorance
It must be X = certainty.
Just as an FYI, he moved there long before it was a wartorn country. He chose to stay. Just as so many wealthy Sri Lankans who could have left did not. Why focus on the wealthy European and not the wealthy locals?