first of all, I didn’t really say it was bullshit. I said that you couldn’t prove that one party was reliable and trustworthy simply because it was more reliable and trustworthy than some utterly unreliable and untrustworthy party.
but, to your question, you don’t seem to understand how this works. I didn’t make the allegation, thus I need not prove that it isn’t true. the burden of proof falls upon the party making the accusation, which in this case, appears to be the government of turkey, who has been known to be irrational about it’s accusations about this very imam multiple times in the past.