as a side note,
Linux in particular is fairly well protected against any destructive programs, due to the use of software repositories or the ability to install from source

Repositories are software stores, provided by your particular Linux distribution - your distro will vet all software in their repos, and you can rest assured that no harmful programs are present

Having the actual source code for programs (while not really for the average person) allows you to actually view what a program does.
If you're concerned about using a program (for some sensitive purpose - financial transactions, or whatever) you would employ a programmer to vet the program, and give his opinion on it's suitability

As I keep saying, anyone can write a program to do destructive things
it's really quite easy.....
but software vetted by either your distro, or some other 3rd party severley reduces the chances of accidentally running a bad program

(this is the beauty of open source software - anything bad is right there, in the code, for all to see - you can't hide bad things in open source software)