Asymetrical conflict.

As much as it is undeniable that Hezbollah started the whole thing, "the asymetrical nature of the conflic was laid bare Saturday", says the Washington Post:

In a war that has witnessed an escalation each day, the asymmetrical nature of the conflict was laid bare Saturday: For each attack by Hezbollah since it captured two Israeli soldiers in a cross-border raid, Israel has inflicted a far greater price. It has systematically dismantled the country's infrastructure, displaced thousands of residents and instilled a new sense of foreboding and fear in the now-deserted streets of this brash, confident city still shadowed by the legacy of Lebanon's 15-year civil war.