The only thing that link shows is that the UN chief is ignoring the facts to gain cheap headlines. Nothing there denies the facts alleged by either Israel nor the UNRWA press release I linked to.
Even if there had been, Israel could have sent in foot soldiers who could use those super weapons called eyeballs to decide who to kill and who not.
Your assertion that under battle you have better control over not killing bystanders need better basing on facts. Foot soldiers on the ground means less control over the fight, as you have to take care of defense as well as attack. This results in more, not less, civilian casualties.
The biggest number of Palestinian casualties this time around, by far, were in Shuja'iyya, where the Israeli forces were taken by surprise and had to bring in artilery support. This simply does not happen in air raids.
Instead, as Israel does not want to incur military casualties of their own which would cause political backlash in Israel itself, they shell at a distance - easy for them but incurring, overall, seven times as many dead Palestinian children as there have been Israeli military and civilian casualties combined. Dead Palestinian children being more acceptable in Israel, obviously, than dead Israeli soldiers.
The objectives of any army in conflict inside urban area has, is, and seems to always continue to be, in descending order of precendence:
1. Get the mission done
2. Minimize own casualties
3. Minimize civilian enemy casualties
The only thing in which the IDF is different is that it sometimes places "3" above "2", and even above "1" above. That anomality is only happening in the IDF. Most other moral armies use the above list as is. Israel used to abort missions if there was a high chance of civilian casualties. Hamas manuvered that into making it impossible for Israel to act at all. Such a thing, while I'm sure would be lauded by some, would be even more immoral. The result is the high number of casualties in this round of fighting.
Israel has a clear interest in minimizing the number of casualties. There is both internal and external pressure to keep civilian casualties to a minimum. Hotheads like you blame Israel for every Palestinian dead, regardless of circumstances and actions, calling for boycotts and pressuring their own governments. Israel has no interest in killing Palestinians. Your asserted indifference is simply without grounding in reality.
Hamas, on the other hand. Well, that's a different story altogether. Every Palestinian dead is a Hamas win. Internally, they call them "Shahids" and claim that they are martyrs. I'm sure many Palestinians would love to call bulshit on this rehtorics, but the simply truth is that they do not. They are probably too afraid to fall out of line or to be accused of "cooporating with Israel", an accusation carrying the death penalty.
Externally, Hamas has equally little incentive to care for their own people. When you see horrible pictures of the dead (and they are horrible), you (i.e. sociocapitalist) don't stop to ask questions. You don't wonder why they did not clear out when warned. You don't seek media sources that will report to you Hamas explicit instructions (orders) to people to "defy" the Israeli warnings. People say that Israel is strong (which is true) and Hamas is weak (which is not as true as people believe, but definitely not false), and assign zero accountability to Hamas' actions. While I'm sure you congratulate yourself on being in the moral right, it is, in fact, your indifference to the truth that allows Hamas to continue to put citizens in harm's way.
Regarding your frace24 link, that story is misleadingly one sided. I would give more specific critique, but I'm not sure what point you were trying to make with it.