Israeli politicians and media do their best to ignore the high percentage of children from the secular and Left of Israeli society who find ways of shirking military service or getting non-combat positions. They love to criticize the yeshiva students' deferment and reduced service, even though at the same time they condemn religious soldiers for demanding strictly kosher food and entertainment.
Motivation is the key to military success, on both the personal and national levels. The secular Left isn't motivated to sacrifice for anyone. They live for the "me," of John Lennon's Imagine.
Imagine there's no countriesPeople who agree with John Lennon are bad soldiers. That's not peace, the thing that John Lennon wanted, it's death. I can't imagine anything more depressing than a life without meaning, without something you love so much you'd even die for it.
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people
Living life in peace...
Compare it to the שמע ישראל Shema Yisrael, Listen/Hear People of Israel prayer:
And you shall love* the Lord your God with all your heart and with all your soul and with all your might.