He had no shortage of enemies, as Noah Pollak points out (via Soccer Dad.) And even beyond his obvious enemies, other ones are being revealed - for example, Kuwait.
But in the end, perhaps the best evidence that Israel was really behind the killings is that the bomber was careful not to kill any civilians in what was apparently a well-trafficked neighborhood. None of Mughniyeh's other enemies, with the possible exception of the US, would have cared in the slightest if the entire block was blown up.
