Perhaps somehow they are seen as aggressors, they did invade Cyprus illegally and still hold a whole city to which no one has been able to return to and is still empty from the 1970s.
http://www.telegraph.co.uk/news/worldnews/europe/cyprus/11038580/Famagusta-the-ghost-town-at-the-heart-of-Cyprus.htmlHaving seen the ghost town and peered through the fence and talked to Greek Cypriots and hearing how thousands of loved ones " disappeared" it did affect how I perceived Turkey.
It's still not resolved today.
I think not everyone wants them in the EU because it is still an unresolved issue and people ( Greeks) still cannot go home and what happened to their 1500 loved ones is still unknown.
Turkey is still unrepentant and holds the city and doesn't give access.
I suspect the relatives are buried in it.
To give it up would reveal their guilt.
As aggressors perhaps the sympathy for them is slightly less.
They still won't resolve the ghost city or try and explain where the missing people went.
There were children among the missing, parents brothers and sisters wondering what happened to them.
Going and seeing it myself and talking to local people, did effect my perception of Turkey.
I don't think they are altogether trusted not among all EU members.
Perhaps people we have conflict with, lessens our sympathy.