You can't prove scientifically that gravity from the earth's mass makes an apple fall.
However, the best evidence is that climate change contributes to the strength of these storms, and by claiming we don't know this, you are denying evidence.
People in the denialist camp keep pulling claims from their rectums and attributing them to climate change realists.
People had lung cancer and emphysema who never smoked. Tobacco companies used that for years to claim cigarettes didn't cause smoking. The tactics never change.