Natural selection is greatly reduced in developed countries for several centuries (basically since onset of disinfection and antibiotics which were big milestones). It is even reduced in many developing countries due to all efforts from developed countries. Earth/Universe is not making balance. See entropy. No balance, but chaos is behavior. Even while chaos in hot to cold water may bring one to conclusion that final temperature is balanced, process itself is not balancing. And chaos is exactly what you get from shooting high energy particles/waves into other particles. (For some, it is beneficial to realize why sky is blue.) It does damage to rats, dogs, monkeys, humans. Same type of damage. Maybe bit different results under same conditions. (Volume of tissues that protect vital organs from damage for different types of radiation/frequencies.) 4G without concerns? Wrong conclusion. Microwave that heats your food would work even on 2/4/5/7/9/... GHz. It uses 2,4 GHz because license to use air. Your wifi at 2,4 GHz has same effects as your microwave, it is just difference in energy level and exposure time.