The Red Berets and the Mafia didn't knock anyone off when Milosevic was overthrown was because they weren't the ones going to be carted off to the Hague.
With the arrest and extradition to the Hague of Predrag and Nenad Banovic, that changed - the government would no longer protect it's criminals and a war started brewing between the mafia/war criminals and the Djindic government.
That war just cost Djindic his life, and Djindic's successor, whoever he or she is, gets to make the choice between allowing the mafia to continue it's parasitic relationship with the Serbian host while losing Serbia's foreign aid and trade, or rooting out the rot and completing the post-Milosevic transition into a nation of laws rather than of men.
But, whatever - the emerging facts relating to Djindic's assassination are obviously far less attractive than your little conspiracy theory, so have fun, and don't mind me or anything that would get in the way of your little proprietary worldview.
Nice spiel, but not believable. Mafioso types simply don't make hits that would bring down the might of the army, especially when crooked politicians can simply be bought. Moreover, these arrests that you keep mentioning have been going on since Milosovich's arrest almost 4 years ago, with each passing year seeing *less* senior people arrested, thus providing even *less* motivation for such a hit, so your theories still make no compelling argument.
Furthermore, your theories continue to ignore the *timing*, in that this hit happened in the run-up to the Iraq War, just as politics for France and Germany became the most vulnerable.
...And it is France and Germany that are keen to keep their "don't-go-to-war-without-the-UN" double-standard quiet, something that they have so far been successful at.