Regarding the risk to Israelis facing the firing squad, you do know that Israel only executed Eichmann (and one other person in a field court) since the founding of the country?
When it comes to the list of things that Israelis fear, being sentenced to a firing squad is very low down.
Fair enough, but I don't think that makes the incentive much different. If you are convicted of a crime punishable by death, your actual punishment is not likely to be trivial.
Government and regime can always change. Post socialist countries convinced border guards, for shooting unarmed civilians, who were trying to escape across country borders. That was a crime even under socialist laws.
If Israel had regime change, new regime and majority of voters would be pro Arab... New government could actually enforce existing laws!
When it comes to the list of things that Israelis fear, being sentenced to a firing squad is very low down.