it’s important to mention wherever that incorrect point is brought up:
the only reason people say there are no viruses on linux (which is wrong from the get go) is because there just isn’t enough market share for lots of malware to be written and distributed with a linux target in mind. it is out there and it is a risk, just much rarer than windows malware. if more people start using linux, user-targeted linux malware in the wild will likely become just as common (and effective) as the stuff targeting windows.
never assume your system is safe by default and requires no hardening or awareness from the user/org.