No, I don't believe use of the term 'MSM' is accidental in any way. To the contrary, it appears obvious to me that it's quite intentional - FOX, Limbaugh, Drudge, etc use the term to position themselves as an alternative. When they all began, the three major broadcast networks were solidly mainstream, as were the NYT and WP. That's changed. People like you, me, and most others here all discriminate more than 'average' people in where we get our information from. There is still a large segment of the population that get their news from traditional sources like the networks, whose content still tends to slant to the left. Don't think that all the afforementioned right-leaning sources sprung into being to compete with NPR.
I don't see how you draw the conclusion that use of the term 'Main Stream Media' implies that anyone is a victim, though. 'Partially informed' maybe, but 'victims'? No.