I've been playing for about 2 months now, mostly open - I have been ganked three times I think and it's obviously not a great experience to get rekt, but at the same time it's part of the game. At this point, I'm ok with the current solutions and all three modes offer different characteristics that I find appealing, depending on my mood and needs.
I'm not sure I understand the point you are trying to make. From my perspective, griefers are a minor inconvenience - but at the same time, maybe I'm not playing when most of them are online or they are active in other regions of space, thus my negative experiences are rather limited, meaning I don't perceive them as such an issue at this point.
Coming from EVE, I can understand the desire to reduce interactions with certain types of players though - it's actually quite an ancient debate (since MMOs have been made) and different humans have different ideas/desires. Having played games for almost 30 years now, I have yet to find a game that has found a good solution in that regard (other than separating the playerbase).
If blocking does the job for you, why not? I just think it's more of a short-term approach in general because it doesn't really address the actual root of the problem. Then again, I doubt the devs are interested in implementing changes that would reduce the amount of griefing or toxic behaviour in general, since that would limit the current gameplay experience for everyone else as well (unless there are solutions I'm not aware of).
Personally, I'd love to see some sort of shadow pool where all griefers would end up, shooting each other and drowning in toxicity until the end of days. If anyone deserves a dark, dystopian universe, it's those guys.