Green_Manalishi, here's what I think...
I believe truly independent music doesn't fall under the same behemoth of control as the mass produced stuff, and therefore doesn't come with the loaded messages, in general. Coming from someone who got into punk rock at an early age, I was exposed to all sorts of politics via the music; the scene, the people and the lyrics often contained a political leaning. This wasn't to say I agreed with it all, and it took a few years to find my feet and think critically for myself; and not just accept what a band or my peers were talking about.
I would say that overall, this music having a message behind it was a positive thing; it made me think about issues on a bigger scale that I would have otherwise come across. Often the general message boiled down to "think for yourself, do what you believe in". Of course, it's rhetoric but it would be too easy to just be cynical; at least it's empowering. Punk and politics goes hand in hand - I'm specifically referring to the "underground". So many bands who I came across, whether it be punk rock, metal or hardcore, prided themselves on not being the same as the mainstream; offering something different, more personal for the audience. This was reinforced by the creativity of the scene; it wasn't just musicians making things happen. There were the people who took risks by booking unknown bands from abroad, people who cooked for them, people who put them up, etc. This wasn't just business as usual, it meant more. The intent was to create an environment where ideas and people were valid, where people could share views and trade records, meet people.
It didn't always work perfectly - many times over the years I came across people who were vegan and looked down on other who weren't, feminists who blamed everything on men/patriarchy and the so-called "P.C Brigade" - a point of contention if ever I saw one. These people were sometimes missing a sense of humour which took the fun away for others, myself included. But personally, I met a ton of great people who I will always be bonded with; through a love of music and creativity, doing things for yourself and trying to carve your own way in the world. Some of these friends I don't see often these days, because they live in other parts of the country, but I know that if I'm in their town, or the other way around, there will always be a place to crash.
I'm purely speaking from a personal perspective here. Underground punk rock has done a lot in terms of giving people a platform to be creative and independent; to consciously distinguish ones self from the mainstream. To me and many others, it's a state of mind more than a type of music or the fashions that go with that. I've never really cared for labels, but I don't mind being called a punk.