And because you cannot run Android on iPhone's processor and you cannot run iOS on Samsung's processor, they have not performed multitouch on iPhone's processor, and the patent has not been infringed at all.

You're all talking and giving references of XXth century virii which infected files.
Virii today use these infection paths:

1.- Exploits on browsers/plugins while browsing infected servers.
2.- Exploits on open ports.
3.- User installing software that carries spyware or trojans.

The paths 1 & 2 are caused by non-updated vulnerable software and somebody MUST do something about that if the user doesn't care.
Path 3 can be mitigated by using an updated antivirus. An antivirus would block the "good virus" too, as it would not be required on that computer.