...I prefer to protect miners from pirates. When that T9 head away from the rocks and he's being pursued by 3 ships, I get involved and let him get back to his work. That's the aspect I like...
This. What would be nice, would be that when you are for example flying around RES sites, you hear a distress call form a miner (is this the "All I was doing, was mining!"). You should be able to send some predefined message to the miner and shuttle to help the defenseless miner and try to whack the pirates. After the battle is over, the miner says in local "Thank you commander <name>, that was a close call"
The mining itself, well I tried that yesterday. Equipped my Python with the stuff, refinery, prospect & collector limpets and was ready for huge pile of minerals. I find myself after 3 hrs of mining in "metallic rings" with bugged limpets and 3 asteroids to mine. I got 8 tons of minerals,metals. I thought, ok I'll try a RES site because there are lots of asteroids to mine. Well, yes there is but approx every time you have the minerals floating around, you get scanned by a pirate and because you have some refined metals in your cargo, they shout to you "hahaa mother lode, I'll take that 1t of Osmium from you!" soo, kill the pirate and then your collectors are expired, shoot new ones blabla

I should blame myself of course that by choosing a RES site, you additionally choose that there will be pirates. A lot. But I'm a bit puzzled that huge star systems have an "asteroid belt" where you go, and there is like 5 asteroids

I'd say that is not an "asteroid belt"
Personally I think that the huge income profit from killing random pirates at RES sites has ruined the economy of the game. Of course there is the aspect of danger involved, but hey with 6-8 local authorities, danger really does not exist. You can still pewpew with sidewinder the ships down with the help from police forces. But if you only think about this from the profit-wise viewpoint, in one hour you make credits as bounty hunter more than one can make with mining in about a week. Not even mentioning the exploring as I see the exploring has nothing to do with credits but is far more "I like to go alone to the stars for a RL weeks" -thing. Not done much trading but it seems to pay quite ok. And if you solo trade, there are only NPC pirates to worry about. Balance is tricky business in this genre of games.
I'm really glad that they introduced much more and more variety missions in the 1.3 patch, I find far more interesting times and really bought an interdictor, before 1.3 the only reason for interdictor was to interdict fellow players. And if one sticks into the "kill pirate x" and "kill n+1 pirates" -missions, no fines or personal bounties will be applied. Plus there are the "smuggle this to there" and "deliver this cargo" -missions still
PP I have no idea, haven't got the time yet to pledge. I understand the mechanics though. Reading comments and posts somehow tell me that it's the Diablo 3 -stylish grind hell.
Maybe to much off-topic, sorry about that.
Safe Journeys Commanders.