Problem with this is that it has to be credible threat. Even when you would fill ISS with conventional explosives and somehow arrange for it to land on reasonab

Problem with this is that it has to be credible threat. Even when you would fill ISS with conventional explosives and somehow arrange for it to land on reasonably precise spot and explode on impact the damage caused will be many orders of magnitude smaller than what you would expedite to do all that (and this holds even when you take the expense as a fraction of relevant defense budgets instead of absolute values)