The soldiers and commanders (of the IDF) must limit their use of weapons and tactics that lead to the harm and unnecessary loss of people and [destruction of] civilian facilities. It is difficult for them to get the most use out of their firearms, especially of supporting fire [e.g. artillery].
(1) Problems with opening fire
(2) Problems in controlling the civilian population during operations and afterward
(3) Assurance of supplying medical care to civilians who need it
The destruction of civilian homes: This increases the hatred of the citizens towards the attackers [the IDF] and increases their gathering [support] around the city defenders (resistance forces[i.e. Hamas]).