If Hezbollah was the choice of the majority of Lebanese, they would have won the 2009 elections. They didn't. And as for infrastructure being 'fair game', the fourth Geneva Convention not only specifically state that warring parties have an obligation to protect civilians but also states that all infrastructure essential to survival must be spared. Where you are correct is regarding the 'track record' - Israel's willful disregard of these basic rules of war has been recorded time and time again, so no, if the IDF does bomb Lebanon's infrastructure in any coming war, it won't be a surprise.
U.S.-led coalition conducts 11 airstrikes in Syria, 19 in Iraq against ISIS targets (Reuters)
from the article: U.S. warns Syria: Stop arming Hezbollah immediately