If he wants to give some other explanation, he is welcome to do so. I reserved a post under the OP for his response so it will be prominent.
Why would he want to give an explanation? Do you really think that whatever happened(Bestmxixer instructions or not), he'd want the Dutch government hound dogs to catch a whiff of the trail? You've already done a crackerjack for them for free by pointing the way for them.
I would also find it unlikely the Dutch government is not already aware of the situation. I don't think they would seize the BestMixer servers and just go home and call it a day.
I don't think he's obligated to answer to you. What authority do you have over him? When the government is sniffing around, I think the best policy is to keep quiet or let a lawyer do all of the talking. It certainly isn't prudent to spill the beans on the open forum just to resolve this accusation. What's the worst that can happen to him if he doesn't answer to you? Some dt members actually give your accusation credence and red tag him? BFD.
I doubt any government would waste time or resources investigating a signature campaign on a forum. They are after the funds that have been mixed (and the people mixing them).