Why not make Norton compatible with other security software?

Why not make norton compatible with other security software.... case in point, I see constantly people getting infected with drive by rogue AV and stuff that gets past norton and the "insert whatever you feel" gurus always say "run malwarebytes or superantispyware" and yet my problem with this is, the same gurus say don't run malwarebytes or SAS as active but only on demand. Funny that other major vendors have no problem with running these side by side, only Norton and McAfee are the biggest "only run us or else funny things may happen". If Malwarebytes/SAS are so good that they can remove stuff Norton misses and are recommened to use, why not be compatible? Just makes sense, no one AV can do it all.

 

[edit: Clarified subject.]

Message Edited by shannons on 11-02-2009 06:36 AM