Oh griefers...the scum of the universe. For the most part griefers are players or corporations that try to enhance their gaming experience by trying to make your gaming experience less fun. In real life these people are called bullies. Recently a conversation took place between me and one of my corp members regarding cloaking and how there is no way to find someone in your system that is cloaked. They believe that cloaking should allow you to hide from viewing the ship out in space and from the overview, but you should still be allowed to find them with probes.
I disagree, I think that the point of cloaking is to not be found. When you're cloaked you can't do any harm to anyone, although that doesn't mean that you can't position yourself to do LOTS of harm when you finally uncloak.
When we lived in a wormhole for a month, there is no "Local" channel showing who is in system and who is not. Unless someone is stupid enough to talk in Local, and they are cloaked, you will never know they are there until it's too late. In known space, you can see who is sitting in the same system as you, even if you can't see them.
Now that we live in Null sec, there have been plenty of hostile people that pass through our system on a very regular basis. Sometimes they enter our system, and then put on the parking break. They sit somewhere in our system, cloaked and doing nothing. Sometimes they do this in ships that can't fit a covert ops cloak, so we know they're just sitting still someplace in our system, unable to warp.
The problem this situation causes is that we don't know where they are, if they have a cyno, sometimes we don't know what ship they are in, and when they're going to leave. I've accepted that there isn't anything we can do about this, and if they want to use their character (most likely one of their alts) and just sit and camp in our system that's fine. We sit on high alert, don't go anywhere in system alone if we do stay in system, sometimes we leave and go to another system, but for the most part we just carry on.
Very regularly the same group of griefers will enter our system with a fleet of about 15, when we've got about 3-4 guys in system either docked up, ratting the belts, or whatever. They come in, start talking shit, tell us we need to undock and fight, that we're fat, stupid, blah blah blah blah blah blah blah. They say anything they can to try and provoke a response that will result in us undocking.
I'm not going to undock and engage in ANY ship that I am capable of flying when I am outnumbered 5 to 1. It's not that I'm scared to undock, it's that I'm smart to not undock. Oh, and linking a kill you have from one of our corp members over and over in local when 5 of you killed a retriever is so impressive. I can't believe 5 of you were able to handle such a big nasty retriever without calling in for more backup. You've earned Val's "I'm not a puppet, I'm a real boy" medal of valor.
I may not like griefers, but I love that eve allows them to exist and doesn't make too many rules against it. Eve is such an open world with one of the primary rules being if you can do it, go for it. If you want to steal your corporations assets, empty the corporation wallet, or report where your corp is so that someone else comes and kills them all, CCP allows this and doesn't try to make rules to prevent it. If you want to plex your account just so you can sit in our system all day, by all means go for it. There may be a consequence for your actions, but if you're willing to take those consequences then cheers to you.
I hate that we occasionally keep allowing them to get a kill on us, but we're still new and learning the ropes. The day will come when we are no longer the rabbit, and can start being the wolf, but we're just not there yet. We're able to protect our system from very small groups of invaders, but that's about it right now.