dmex said:
More about getting money from Linux, Apple, Unix users, the young and old etc... for fighting the stupidity of the few users who just dont care about viruses on their machine, if they did then they would take measures to remove them.

Education would go further and allot better than a tax because then they might learn something about how to combat the problem themself, a tax would just let people continue to be ignorant.
they don't want the problem to go away, they would rather have you to remain ignorant.