Just shows that people really look hard for the bad things a player does (and notes them) when they have a pre conceived opinion about a that player. Scapegoat theory etc. In the case of Lia, he might give the ball away a couple of times in a game (less than usual) but people will be frustrated a lot more when he does it because he's been the worst offender in previous games. It's understandable in a way but I saw a lot of things he did well against Perth and I found that easy to see because there were a lot of other players that were having shockers.
There was an interesting study that came out about a year ago which documented that for a majority of average educated people we tend to immediately accept facts/findings/data which agree with our preconceived ideas (or cultural norms, or religion or whatever), but that we tend to question, discount or disbelieve/ignore those which plainly contradict these preconceived ideas (even if the findings/data are correct).
The study was originally based on research related to global warming, but applies equally to Vince Lia, methinks, as he's been blowing hot and cold lately.