Do mosquitoes serve any good purposes?

Bats consume mainly mosquitoes in some areas. If they were't there, the bats might not survive. Since bats eat up the other insects that are active after sundown. That they fly at night is a survival strategy. Larger insects don't stand a chance at night because of them. So instead of having lots of mosquitoes, all the insects would probably be active at night. We would end up with tons of even larger bugs breeding at night, swarming and landing on us all day. Spreading diseases and probably wiping out the human race.

Be glad it's just a tiny mosquito and not a swarm of flys or night time wasps.