I agree that while William allowed Lenin to traverse across Germany in the "sealed train" to get to Russia, knowing full well that Lenin was intent on overthrowing the government, it is not fair from a historical perspective to imply that the Kaiser (or anyone else) would have had knowledge that the murderous rampage the Romanovs experienced was the plan. In fact, it wasn't the plan even in Lenin's mind at the point he crossed Germany.
Plus, if we look at current politics and the global notion of free passage, I doubt an American president or any of the leaders of western Europe, for example, would deny an outspoken opponent of the Taliban a safe journey across any of their nations.