Why Snape doesn't get DADA job

[theadimail]

No: HPFGUIDX 108277

Hi,
   I am sorry if this has been posted before but I have a theory 
about why Dumbledore consistently refuses to let Snape have the DADA 
techer's job. It's very simple actually.
   He knows when Snape applied that one day Harry will be coming to 
this school and DADA will be the most necessary and urgent skill the 
school can give him. And knowing Snape's animosity for James and 
others, he thinks that Snape might be obnoxious with Harry and might 
prove to be a very bad teacher to Harry and worse scuttle Harry's 
interest in the subject. Look at what happened to Harry and his 
potions. If the same happened with DADA, he would be left defenceless 
and resourceless wouldn't he?
 I think that's the simple reason why Dumbledore refused Snape for 
DADA job eventhough he when there were no other appplicants or very 
bad candidates. If his interest were alive, Harry will at least learn 
things on his own. But under a hostile and obnoxious teaacher he 
might just lose interest.

Bye
Adi