These are done by political parties to have certain political gains. If any muslim (group or individual) really wants to have any gain through this terror activities then first and foremost of all they will 1) Threaten or take action against people like N. Modi or L. Advani who are pretty notorious in muslim community. 2) If they do sth really bad, then they will be detrimental to these people first which hardly happens..Especially against N. modi. 3) If sb thinks it is not very much possible because they are under security zone which can't be easily breached then howcome they breached the most secured place like parliament. 4)I surmise the last blast can be crucial for the ongoing Karnataka elections. If u see during BJP ruling also the terrorist activities happened and in those parts particualrly where BJP was the leading party. Muslims are very soft targets now a days as the public easily beleives the way terrorists groups are blamed every other day and it is very well known to all of us that hardly any group takes the blame and the case is closed without any further investigations.