Truth of the matter is, I wager very few of these blockaders initially intended to be rude dudes. They play the game to have fun, just like the rest of us. But, when the game gets boring and they still have a stake in it, they will resort to stupid rude behavior, griefing, because they do not take the game as seriously as you or I, and just figure whatever is fun to them is a successful way to enjoy the game, even if that method us griefing.
I don't think attempting to setup and enforce a blockade is evidence of not taking the game seriously; quite the contrary really.
If CGs will not be profitable in Solo and there will be blocades in Open, players simply will not play CGs. It is quite simple. CGs are fun without griefers and they are also a good source of money for newbies. But for more seasoned players, they are lost time, if you remove the fun factor of helping the common good.
"Common good" is subjective, and plenty of player derive entertainment from opposing CGs that are contrary to their own personal goals.
WHAT? A voice of reason on this black hole of human thought and emotion??
I don't consider banishing people from the game for what they do in the game, unless they are breaking the rules of the game, to be remotely reasonable.
"Adding more things to do" and "get rid of the garbage" are not mutually exclusive. Treat the cause, sure. Add more things to do, sure. Accept "well they were only bored, those zany kids" as justification for being antisocial and 'amusing themselves' by setting the galaxy on fire, not so much. Not making it clear that the worst sorts of antisocial and abusive behaviors are absolutely unacceptable just makes them feel more entitled and reinforces their belief that if they act up like idiotic goons they get more cool toys to play with.
Nothing against the rules about being antisocial...and there shouldn't be. Not that most of these groups attempting blockades are "antisocial". Indeed, it takes a great deal of interaction and organization to even make a noticeable attempt at such things.
There are only two kinds of "trash" I encounter in Elite: Dangerous:
1. People who break the rules, by cheating or exploit bugs, to achieve their ends.
2. People who would implement rules that would limit behavior that does not involve cheating or exploiting.
If you don't like how someone is behaving in the game and you cannot ignore or evade them, either leave the area, or shoot their ships down.