Evolution does not create creatures because they have a specific value to the nature but rather because there was room for it to develop. There are actual suggestions to eradicate the mosquito as they do not provide any value to anyone and does more harm then good. But wasps do provide some value. They do compete with bees but they do also thrive in areas where there are few bees. Their aggressiveness is part of this as they can thrive with animals that frequently raid bee hives for honey. Wasps do also have an easier time consuming fallen fruits and other dead materials as they have stronger jaws then bees. So there are quite a few areas that would be very different if it were not for the wasps.
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