Definitely not. Viruses perform key roles in ecosystems, particularly in ocean ecosystems. Their infection and subsequent killing of organisms provides a vital mechanism for cycling nutrients. They also help keep algal blooms in check. Viruses kill 20% of bacteria in the oceans everyday.

Viruses also provide a mechanism for horizontal gene transfer. A protein that is critical to the formation of the human placenta has a viral origin.

Viruses have a massive impact on life, but we're just now starting to realize it.