I remember seeing someone talking about wanting to knock down a well-known pirate group's BGS faction specifically because "they're gankers and I want to hurt them and it's the only way I can".
They hadn't even ganked him personally. He was just so mad at the nebulous idea of gankers that he felt motivated to seek out something of theirs and try to destroy it.
As long as it's in the game it's all good with me. It's emergent content, motivation to play, to group together against a common enemy. A lot of the motivation for my actions have been rooted in a desire for vengeance
If someone is better than you at some activity it's understandable that they respond in a way they think they will be better at. Never start a fight unless you are pretty sure you are going to win & all that
With BGS work blocking your opponent does nothing tactically useful, meeting them can though like negotiating peace treaties (diplomacy) or intimidation (encouraging a healthy respect for potential (in-game) repercussions, gunboat diplomacy). I have met plenty of ganker-types, and in some cases been able to find ways to make use of their skillset (or at least activities they enjoy doing more than I do) to intimidate my enemy, and have had 'assassins' sent after me & others on my side it's exciting, it's by no means certain I will survive but rebuy doesn't lose much when supporting or opposing factions. In part I often carry a lot of explo data because it gives me a stronger motivation to survive any encounter regardless of the hostile attackers motivation.
IMO faction conflict played out by both sides in open is the game at it's best, not only for the hunter vs prey mentality but also because when you meet there is the opportunity for diplomacy. When I'm going up against a group (or that have all blocked me I guess) that plays in a private group those opportunities are missing & it just turns into a boring grind-fest.