Question about the troubles in Lebanon

Hello,
I don't have much knowledge about Lebanon, but my friend, who is a Maronite Lebanese, said that the biggest reason was that a significant portion of the Christian population, who could have acted as a counterbalance, left Lebanon after the conflicts involving the Palestinians and Israel. Since it was easier for them to move to Europe or the U.S. as Christians, the turmoil was allowed to continue due to the lack of local resistance against groups like the Iranian proxy h*zbollah.

How valid is this criticism, and do you agree at all?

Sorry if this is a dumb or inappropriate thing to ask/discuss here...