Sadly, we will never be able to prosecute these pfishers and spammers due the lack of comprehensive international laws and extradition restrictions. And any OS that gains a significant percentage of the market is or will be targeted proportionally to its popularity as Apple users are finding out lately.
My solution (insane and impossible as it may be) is to require training and licensure before allowing people on the internet. That would virtually eliminate the millions of people who fall for bogus scam artists, Nigerian $Millions and malware hoaxes. If we could eliminate those who unwittingly acquire and spread these viruses, the criminals would go find another more lucrative form of financial theft and digital mischief.