Why Israel Must Destroy Hezbollah
Continuing to talk with somebody who is lying to you and working to undermine everything you are doing, is not a sensible long-term strategy. It conveys weakness, and too much eagerness to artificially paper over profound differences, and in Israel's case, has damaged its deterrent capability.
In the case of Hamas and Hezbollah, the word "engagement" has little meaning. Any engagement or resolution of an issue between Israel and one of these parties (e.g. prisoner exchanges) has tended be on their terms, and they have always moved on to fight another day with the same goal of destroying Israel.