Question for Snape Bashers

[pippin_999]

No: HPFGUIDX 101757

We are concerned for Neville and Harry because we agree that 
abuse can cause lasting damage, meaning symptoms that 
persist even in the face of powerful incentives to change. These 
symptoms may include paradoxical effects like sadism and 
inappropriate aggression. We agree it would not be realistic to 
deal with abuse in the novels and not show these effects. 

Why, then, are Snape's sadism and inappropriate aggression 
not read as  the realistic results of abuse? If abuse causes 
lasting damage, why expect that Snape should have gotten over 
it?

Pippin