This is about intolerance in both Muslims and Non Muslims.
The question can be phrased in many ways to speak about many specifics:
1. The EDL are intolerant of Muslims (or what they call "extremist Muslims" which seems to cover all Muslims). Should their views be discussed, argued against, their protests counter protested, or should they be ignored?
2. The same can be said of Muslims. When Muslims present views that seem to not fit with your understanding of Islam, when they show intolerance (often towards other Muslims too), should their views be challenged or should they simply be ignored?
The problem with ignoring is that it may embolden people to go further because their views are unchecked and have not been scrutinised by reality.