Torah needs to be supplemented with commonsense

 Rashba (3:393): My view is that if the witnesses are believed by the judges, then it is permitted to punish the accused financially or physically depending upon what the judges think is appropriate to be beneficial to society. Because if we insist on doing only what is specified by Torah law and not to punish except as specified in the Torah – the world will end up destroyed. That is because the elementary rules of a functioning society will be breached and consequently it will be ruined. It is an established practice to punish those who physically harm others…Every community makes judgments in order to preserve it and this is true in every generation and every place according to what is perceived as the needs of the times. For example we see (Sanhedrin 58b) that Rav Huna, who was in Babylonia, would amputate hands as punishment. Therefore these judges you referred to who punished the accused not in accord with Torah law – if they saw the need for it to preserve the society – they have correctly acted according to the halacha. This is true when there is a specific order from the king as we see in the case of R’ Eliezar the son of R’ Shimon bar Yochai in Bava Metzia (83a)

Rav Yosef Eliashiv (Kovetz Teshuvos 3:231): … Question: If someone is sexually abusing a boy a girl in circumstances which we can’t stop him from continuing his evil deeds – is it permissible to notify the government authorities? Answer: Rashba (3:393) states: “My view is that if the witnesses are believed by the judges, then it is permitted to punish the accused financially or physically depending upon what the judges think is appropriate to be beneficial to society. Because if we insist on doing only what is specified by Torah law and not to punish except as specified in the Torah – the world will end up destroyed. That is because the elementary rules of a functioning society will be breached and consequently it will be ruined. It is an established practice to punish those who physically harm others…Every community makes judgments in order to preserve it and this is true in every generation and every place according to what is perceived as the needs of the times. For example we see (Sanhedrin 58b) that Rav Huna, who was in Babylonia, would amputate hands as punishment. Therefore these judges you referred to who punished the accused not in accord with Torah law – if they saw the need for it to preserve the society – they have correctly acted according to the halacha. This is true when there is a specific order from the king as we see in the case of R’ Eliezar the son of R’ Shimon bar Yochai in Bava Metzia (83a).” We learn from the Rashba’s words that when action is needed for the well being of society (tikun olam), that the Jewish sages have the ability in every generation to act to preserve the society and to repair breaches – even when there isn’t a specific order from the king. The Ritva (Bava Metzia 83b) has stated that this order of the king is “if the king says to capture certain criminals, even though the government will judge without witnesses and warning [as required by Torah law] and there is no functioning Sanhedrin [as required by Torah law] – it is still permitted since he is acting as the agent of the king. Since it is the law of the land to execute criminals without the testimony of witnesses and warning - as it states [Shmuel 2’ 1:5-16] that Dovid killed the Amalekite ger who had acceded to Shaul’s request to kill him -the agent of the king is like him.” However according to what has been said, in a matter which is needed for the well being of society (tikun olam), it is not needed to have been ordered to act by the king [in order to act as needed]. However, it is permitted to notify the government authorities only in the case which it is certain that the accused has been sexually abusing children. Informing the authorities in such a case is clearly something for the well being of the society (tikun olam). However in a case where there is no proof that this activity is happening but it is merely a conjecture or suspicion, if we permit the calling of the authorities - not only would it not be an improvement (tikun olam) - but it would destroy society. That is because it is possible that allegations are being made solely because of some bitterness the student has against his teacher or because of some unfounded fantasy. As a result of these false allegations the accused will be placed in a situation for which death is better than life – even though he is innocent. Therefore I do not see any justification for calling the authorities in such circumstances.