I found an example of the concern of Muslims about violence by Muslims in an article about the conviction of Aafia Siddiqui in U.S. courts, Dawn Editorial, 2010-09-25.
"Denialism embedded deep in the public psyche has allowed the real threat to the Pakistani state and society, religious extremism, to grow to dangerous proportions. The ‘impossibility’ of a Muslim committing a crime against another Muslim or the sympathy extended towards those who resort to violence against the West as ‘retaliation’ for its crimes against Islam and Muslims serve to obfuscate the campaign by a militant, fringe minority to hijack a religion of peace. The cancer within grows, ironically even as it is occasionally held up as a symbol of heroic resistance. If the government can, it must try and bring Aafia Siddiqui back to Pakistan, given the unsatisfactory conclusion to her trial. But long after the story of Dr Siddiqui will eventually fade, Pakistan will still be faced with an internal enemy it has not even begun to comprehend."Also see "Siddiqui's 'missing years', Stories differ over the whereabouts of Pakistani scientist between 2002-2008". This doesn't read like a one-sided headline that Siddiqui must be innocent because a U.S. court said she was guilty.
You can also read a long Wikipedia article about Siddiqui. It is a complex story.
Whatever the facts in the case, ask yourself how you would feel and act if the Chinese invaded the U.S., if they captured you as a "terrorist", and if they tried you in Beijing.
