In individual virus might be that - but thats not how virus live as a species/group/form of existence. Usually they are a thriving and useful part of the ecosystem they belong to.

Virus, under normal circumstances, will live happily along a bunch of other guests in foreign hosts.

No issue.

It's human that give virus a bad raputation! We breed the fuck out of them and then are shocked when this bits us in the ass.

Or in other words: The only way this comparison (human==virus) gets accurate, is when you use the human-super-breed version of "virus"

(edit: leave vs. live)