Maybe Israel has been quite silent in the PR department, as its to Israels advantage to appear to be losing. Imagine the enemedia with wall-to-wall coverage of the Hezzies being clobbered - that would be a tremendous boost to those that want an immediate cease-fire. In the current situation, with only small leakages of Israeli kick-butt, the clamors for immediate cease fire are more subdued.
If Israel wants it to look like things are going badly, then that encourages the Hezbos to stay and fight, and if they stand and fight instead of drifting into the shadows until the next opportunity, then they are easier targets.