Is the reason why so many gankers and griefers are in Deciat is because of Felicity Farseer? She is arguably the most useful engineer and they suspect other commanders who travel here are flying un-engineered ships, easy picking?
DING DING DING ! We have a winner.
Most CMDRs who are good at PvP don't hang out there, it's not a challenge picking off un-engineered ships or n00bs. Felicity is usually the first ENG to visit since a modded FSD will make the others a lot easier. Even if you're not into combat, a G5 FSD will make trading and exploration better.