Excellent article.
Why is so hard for people to understand that when an armed force (and the Gazans ARE armed) comes to attack another armed force and tries to invade their territory, that they get shot!
Only a few weeks ago in Syria, an armed force tried to attack US forces over another de facto border (the Euphrates river) and the US smashed them killing 200-300 of them. No one made much of a fuss.
Its no different at the border with Gaza except that Israel tries to minimise enemy casualties.

If assemble a force and enter a conflict zone to attack a stronger military power you should be very lucky that they don't kill the lot of you.
Israel only killed 60 out of 40,000. Israel would be perfectly within its rights to kill all 40,000 enemy combatants in the conflict zone.