[ssener2001]

It is understood from this these animals are created for biting human beings and sucking from our body. Maybe there are some benefits we may does not know

[darkpuma]

Sounds like a naturalistic fallacy and/or a just world fallacy.

There's not a silver lining to everything. Some things just suck. Nature is brutal, not caring. Many relationships between organisms are purely parasitic, exploitative, not symbiotic. If you really want a downer, look up what some varieties of the cordyceps parasitic fungus do to ants.

[lorenzhs]

For anyone else not familiar with cordyceps fungi, here's a three-minute clip from BCC Planet Earth: https://www.youtube.com/watch?v=XuKjBIBBAL8

[obituary_latte]

Not humans specifically but any warm blooded animal. The only benefits likely are to the insect (not animal) itself.

[50656E6973]

Mosquitos kill more humans than any other animal