They kill humans, and from a more balanced perspective, that’s a good thing.
I’m not saying that I’m gonna start wearing a t-shirt reading I [heart] mosquitoes anytime soon, but it (the above-linked article) does raise an interesting thought, one that you may not often have occasion to consider.
(The point, for those of you who are easily distracted, is that mosquitoes have historically played a big part [and still do, to some extent] in controlling human population.)
If you’re interested, the article has other points to make as well. Like the fact that if we were able to completely exterminate the dread insect (and we won’t be able to), the complex web of life of which the squitoes previously were a part would not unwind. And so on and so forth. Anyway, you should read it. It’s a quick read. I doubt you’ll regret it.
(NYT: “No Skeeters, No Problem? Not so Fast” by James Gorman [June 22, 2004])