Thats your choice, your DEFINATLY overreacting about this, if you dont wanna use it, then dont, others can make there own decision.  And I said specifically will stop 
MSN Messenger viruses, NOT all viruses.  Made only for MSN Messenger borne viruses. 

, so please, Let others decide if they want to use it for themselves, just like I let others decide if they wanna use MSN Skins which I dont like, I surely dont tell them NOT to use them.