Force is justified where the situation merits it's use as a last resort.
I think all Sikhs believe that there is a place for the use of physical force where we as a Panth achieve a positive result which is tangibly in our Panth's best interests (but not to the detriment of innocent human beings).
However, i think much of the discussion boils down to what is considered Beadbi.
In terms of saroops of Guru Sahib being burnt every so often by paid criminals working for our opponents we have to understand that this is a deliberate action to provoke Sikhs and throw us off course by way of diversionary tactics.
Our enemies want us to focus on such acts of Beadbi in order that we take our eyes off the bigger societal Beadbi taking place in opposition to Gurmat in Punjab as a result of drugs, alcohol, female infanticide, biraderi apartheid, cancer, illiteracy and poverty primarily.
So the Suraj Mani case was a classic example. Our opponents get their deranged mental patient to do Beadbi of Guru Sahib. Our opponents know our blood will burn at such vile and despicable acts. Predictably 3 Singhs respond and dispatch the dusht. Unfortunately the overall consequence of which is that the fake Suraj Mani sect gains a marytr and more followers whilst 3 Singhs get to spend the rest of their lives rotting out in an Indian jail unable to serve the Panth.
I strongly believe that in the circumstances, we need to make a calculated decision on where best to deal with things in a violent manner and those circumstances where we come out as losers as a consequence of responding.
So if people are selling drugs, killing people via poisonous homemade alcohol, killing unborn female children, discriminating on the grounds of biraderi, misappropriating cancer treatment funds, stealing from educational resources or exploiting workers or children ... then without a doubt extreme violence should be employed for the greater good including flat out killing the worst of the worst. In fact we are currently not using enough violence.
But where saroops of Guru Sahib are deliberately being burnt by low level pawns of our opponents in order to divert our Panth's focus from the bigger problems in front of us and thereby trapping a few Singhs into rotting the rest of their lives out in an Indian jail, then I strongly believe that we need a new approach which realises that our Guru Sahib - Shabad Bani - can never be harmed by something as weak as fire. Because Gurbani is eternal and unbreakable and can never be destroyed. So for every saroop that some lunatic decides to burn we should resolve to distribute 100 more saroops amongst those who currently do not have access to Gurbani. Instead of dozens of committed Singhs rotting in jail we need those same type of passionate Singhs to use their dedication to the Panth by serving on the front lines in the lifetime modern day dharam yuddh that we desperately need against drugs, alcohol, female infanticide, biraderi apartheid, illiteracy, cancer and poverty affecting millions within the Panth and our future.