It is obligatory to encourage youth to do good. Their activity to do good should be appreciated. Yet, they should be guided to do so with leniency and wisdom without haste, because youth and others have excessive jealousy that may push them to commit forbidden acts. Both older people and youth should be guided to examine matters rationally and seek the truth in all their actions, so they will behave properly.
Seeing some evil actions being committed during the lifetime of the Prophet (peace be upon him), someone out of jealousy for Allah said to the sinner, "By Allah! Allah will not forgive you." Whereas, Allah (Glorified and Exalted be He) says: Who is he who adjures Me that I would not grant pardon to so and so. I have granted pardon to so and so and blotted out your deeds (who took an oath that I would not grant pardon to him). Narrated by Imam Muslim in his Sahih.
This is because he exceeded the limits prescribed by Shari`ah when swearing that Allah (Exalted be He) will not forgive the sinner. This entails that the Muslims should make sure of things and beware of the danger of the spoken word and excessive jealousy.
Indeed, the youth, older people, and others are obliged to remove Munkar (that which is unacceptable or disapproved of by Islamic law and Muslims of sound intellect) but they should do so with leniency and wisdom. They should abide by the text of the Shari`ah (Islamic law). They should not exceed the limits prescribed by Shari`ah lest they become extremists like Khawarij (separatist group that believes committing a major sin amounts to disbelief), Mu'tazila (a deviant Islamic sect claiming that those who commit major sins are in a state between belief and disbelief), and those who followed in their footsteps.
On the other hand, they should not decrease their efforts lest they should compromise and abandon the commands of Allah (Exalted be He). Rather, they should be moderate in their words, denial, and seeking the reasons that will help their advice accepted and effective. They should avoid the means that may make people refrain from accepting their advice or prevent society from availing of them.
Allah (Glorified and Exalted be He) says: And had you been severe and harshhearted, they would have broken away from about you
The Prophet (peace be upon him) says in an authentic Hadith: Kindness is not to be found in anything but that it adds to its beauty and it is not withdrawn from anything but it makes it defective.
The Prophet (peace be upon him) also says: O Allah, who (happens to) acquire some kind of control over the affairs of my people and is kind to them, be kind to him, and who (happens to) acquire some kind of control over the affairs of my people and is hard upon them, be hard upon him. Narrated by Imam Muslim in his Sahih.from the Hadith narrated by `Aishah (may Allah be pleased with her).