So your theory is based on nothing then. Because you don't want to assume it was a Muslim terrorist, you immediately discount the possibility and also rule out any chance for conspiracy in general. Is there more to it than that it was that the basis?
Why immediately jump to conspiracy though? Why should I base my theory immediately on conspiracy?
Ted Kaczynski spent years bombing people, nothing to do with government or muslims or conspiracy, just a crazy guy.
Timothy Mcveigh bombed the OK federal building, nothing to do with government or muslims or conspiracy, just a crazy guy.
John Muhammad sniping random people in the DC area, nothing to do with government or muslims or conspiracy, just a crazy guy.
There is literally nothing about simplistic amateur home made bombs in a backpack that tell me anything other than random crazy guy.
There is no reason what so ever that tells me I should think "conspiracy" in this situation.