Islam critiqued runs to a eunuch's defense; prophet's wanton punishments?

In answer to the video "Muhammad did it. Therefore it is not sinful."

The Quran gives to all people the benefit of the doubt. Muslims are told to assume the best rather than the worst in people, unless there are solid reasons for suspicion, especially if they are from one's own comunity 24:12-18. One's privacy, including the privacy of public figures, cannot be compromised based on suspicion 49:4-5,24:27-29.

The code of law of many developped nations do not issue a search warrant unless there is solid evidence to back up an accusation.

One's privacy, including the privacy of public figures, cannot be compromised based on suspicion 49:4-5,24:27-29. This notion reaches such an extent in Islam that one of the early caliphs suspected that a particular individual was committing adultery, jumped over his wall and caught him in the act. The man protested that even the caliph had no right to spy on him in this manner, to which the caliph relented, continued his inspection of the city and mentioned nothing of the man's identity to anyone. 

As always, when trying to understand a Quranic passage and even more so a particular hadith, it is with the aforementioned relevant information that one should interpret all related topics. For example when the prophet told Ali to go kill a man rumoured of adultery with Maria the copt, without requiring first the high standard of testimony, then it should be understood, as it was by the scholars of hadith, including as early as Jaafar al Saadiq, that the prophet was teaching those who slandered Maria, that presuppositions can be totally baseless and harmful. It is to be kept in mind that the prophet told Ali that whatever mission he sends him to accomplish, he must first make a proper investigation prior to acting as per the prophet's orders 

"Ali said: I said: O Messenger of Allah, when you send me on a mission, should I go and do what you tell me to do (with no delay) or witness and find out what someone who is not there cannot find out? He said: 'Witness and find out what someone who is not there cannot find out".

Ali acted exactly as per the prophet's recommendations, and as it turned out, the man in question was an eunuch, who was consequently left unbothered. The whole incident strongly demonstrated the prophet's as well as the Quran's repeated warnings against false suspicions. This eunuch's name was Jaarih and was gifted to the prophet along with Maria by an Egyptian notable, to serve Maria within the prophet's household. Common sense dictates that the prophet was aware of Jaarih's condition and that the Egyptian ruler had told him about it.  There is a reason why the hadith compiler himself did not include that narration in his book of legal judgments and so he did not understand it as setting a legal precedent. Furthermore this was by no means the only rumor spread by the prophet's malicious opponents. There are other occasions where the prophet and his household, as reported both in the Quran and ahadith were the unjust targets of slander and never did the prophet adopt such unilateral, punitive measures against the accusers or the alleged culprits. On would expect to find a precedent, a pattern indicating the prophet's supposed inclination for impulsive, arbitrary judgements the likes his opponents claim in regards the incident with Jaarih.