In both 1967 & 1973 Israel encountered anti aircraft fire and today simulates AA fire from modern systems both during war games with the US like Juniper Cobra or using its own facilities like Hawk missiles etc and more reciently simulators Just because the IAF hasn't had to deal with AA systems in recent conflicts doesn't mean its not capable. Just because it is capable of dealing with AA doesn't mean that it wants to, all militaries even countries like the US with all their hardware prefer to fight an enemy who has weak defenses Also pre emptive strikes can save lives of your people in 1967 Israel lost hundreds of soldiers Egypt alone lost around 20,000 men. In 1973 when Israel was caught off guard the casualties were much higher. So better for all side if the enemy is weak then they wil be less willing to start a war. Why do you think that Israel insists that any future palestinian entity will be unarmed and wants Hizbollah disarmed?
Islamic State destroys part of Syria's Temple of Bel, monitoring group says (Reuters)
from the article: U.S. official: Arming of Hezbollah could spark Israel-Syria war