With these different interpretations given...
With these different interpretations given, whose over all meaning is that of safety and security, we can understand that when we greet Imam al-Husayn, peace be upon him, with this phrase, what we are saying is that we, who are visiting the Imam or are reciting this visitation from far away, that we are promising the Imam that no harm or infliction of grief will ever emanate from us unto the Imam – not at that particular time that we are addressing him, nor at any other time – meaning that we will do our best to keep away from breaking the laws which they promulgated.
We understand that their entire purpose of existence was to guide and rectify humanity and to keep us on the path of tawheed and the obedience of Allah and this includes the obedience of all of their teachings – including the moral illnesses such as pride, arrogance, boasting, miserliness, love of the self, love of power, backbiting, etc… Thus, when we recite these passages we must also work to ensure that we remove all such negative ethical traits from within ourselves so that we do not cause hurt or grief to the Imam.
When we have done this, then our ‘ Salam’ towards the Imam will be truthful and sincere. It is through the recitation of the greeting and its repetition that we seek spiritual closeness to the Imam and we instill the love for the Imam and his teachings within our lives and we work to remove all of the negative traits which may have built up within ourselves over the years.
Such greetings to the Imam and his companions and family members announce to Allah, the Prophet, the Imam and to our own inner heart that we will not rest until we have removed and annihilated all of the inner demons we carry and that we will also not rest until all external evil forces have been destroyed and reduced to mere mention in the books of history.