As far as I can tell Israel doesn't particularly care for even looking like it's trying to behave responsibly. I don't think they've held anyone responsible for even some of the most obvious war crimes we have evidence of being committed.
That said the soldiers pulling the trigger are committing crimes. These are patently illegal actions to a common person standard which eliminates any defense of following military orders. That being said the soldiers, at least, are committing crimes. Accountability starts at the source of the crime.
If the government is ordering these actions then those are illegal orders, according to international standards of military conduct. The soldiers on the ground must ignore those orders on the basis of patently illegal conduct according to a common person standard and the officials facilitating those orders can be investigated for issuing war crimes.
As an example read about Slobodan Milošević
https://en.m.wikipedia.org/wiki/Slobodan_Milo%C5%A1evi%C4%87
In functioning democracies in general, sure, you have to be careful not to tar everyone with the same brush. But in the specific case of Israel in 2015, it's not realistic to argue that the government isn't a single entity, so some parts of it may not be responsible (or even in favour of) crimes against humanity.
Because that is what keeps the ICC off of their backs. The ICC only has authority to step in in cases where national jurisdiction is unable or unwilling to prevent and prosecute war crimes.
* Patently illegal conduct, according to common person principle, is always illegal. There are no legal exceptions.
* If you are fired upon you must return fire. Uniformed militaries are obligated to defend themselves. There are no exceptions to this, except the prior point. When these two points are in conflict the prior point always wins.
* Uniformed service members are required, by law, to follow orders given to them except for the prior two points.
That is the law. It does not matter what specific scenario finds tenable or practical, because combat is inherently challenging. In most cases this is highly impractical, which is why urban warfare is so challenging.