Not the same basis at all. You can't deny there is genocide in Gaza because there is extensive photographic and video evidence, aid openly going from the US to Israel, plenty of refugees seeking asylum in neighbouring countries, palestine voices talking about it and so on. Israel themselves seem pretty nonchalant about it. Similar but not equal evidence arose in Armenia, apartheid South Africa, nazi Germany and so on.
There are pictures of unidentified prisioners and some corporate media used to make pretty extraordinary (as in out of the ordinary) claims about them. No we don't need as much proof as UFOs, its not even on the same ballpark.
So I can repeat my reasoning with more context: Where is all that evidence of Muslims being genocided by the droves over there?