From the outside, it looks as though Hizbollah is not wanted in Lebanon.  Especially post-blast.  It is very difficult for an insurgent force to take root when the large majority of the populace doesn't want them there.  The leader of the Christian party was killed in the blast, if I read correctly.  I'm not sure what's next, but the Lebanese people do not seem to want to allow Hizbollah to operate with impunity any longer.