...add how motivated.
The Israeli can not afford to lose one war, the Egyptians can always count on the UN to save their bacon if it looks like they are going to lose.
Under those conditions, as a pilot, do you risk it all or do you play it safe?
Given my perception of the nature of fighter pilots, I can imagine an unmotivated one.
Of course there are stories of Arab fighters being shot down with a shot being fired. The pilot ejected the second the lock-on warning went off...