Well, it’s a bit more complicated than that. Otherwise microwaves and stoves would be useless. The amount of radiation at a given frequency is also a factor.
That said, 5G towers are not anymore of a threat than any other tall structure. Yep lots of birds and bats fly into them. Cats are a much bigger cause of death.
The only plausible issue than I’ve heard of for 5G is remote sensing or astronomy related. The 5G signal swamps out natural sources in those frequencies. https://weather.com/news/news/2019-04-30-5g-networks-interfere-with-weather-forecasts