the arrest warrant was not in the public interest and therefore ought to be scrapped
Sorry. This "public" wants the arrest warrant to terminate upon death, not before.
Otherwise it's sending a clear sign that the simplest way to avoid the law is to run into some random embassy with no extradition agreements, incarcerate yourself, then bitch and moan until everybody is like "oh poor you, let's forget about everything shall we?".
Screw that. If he's guilty he will be judged. If he is innocent he will be cleared. But hiding is neither, hiding is evading the process of law. It is not even remotely in any public interest to permit that to succeed.