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Basically anything that is a virus is infecting a host in order to reproduce and survive, and by its nature doesn't really care what harm it is causing the host. Just like we don't care (not enough...
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Source: https://writers.stackexchange.com/a/40493 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/40493 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Basically anything that is a virus is infecting a host in order to reproduce and survive, and by its nature doesn't really care what harm it is causing the host. Just like we don't care (not enough to stop) if we are destroying plants to eat them, or even destroying animals to eat them, it is part of our survival, and most of us actually enjoy eating, and meat eaters (including me, but in general animal exploiters, including non-meat eaters that will still eat eggs, honey, milk, cheese, etc) still enjoy their meals. Our own human sentient enjoyments are often directly linked to survival skills or traits; nearly all adults (of any gender or sexual orientation) enjoy sex and find it fun. Our sports and games are competitions and often thinly disguised, formalized warfare or pursuit. Childhood games like "hide and seek" and "tag" are correlated with hunting behavior, a survival skill. So are most physical games. Mental games are about strategy and planning, also (for humans) survival skills. I think perhaps your sentient virus finds "fun" in things related to their original purpose, infecting hosts, taking control and manipulation. These come across as "evil" but are just its nature, doing these things activate its pleasure senses, built to reward its success in replication. Kind of like sex IRL, for most people it is fun and it feels good even when we know there is zero possibility of it resulting in reproduction.