If the proverbial 'everyone' does it rather than looking into the alternatives, though, it might become less responsible.
Tiny things can add up into big things when summed over a large population.
Hey, all I said was that people should consider the option of using a birdbath heater-that in some situations, for some people, it might be a good choice. In fact, the whole point is that if we want to promote wildlife-friendly landscaping practices, we need to tell people about options as well as about constraints. Of course, homeowners shouldn't waste electricity or introduce noxious species or do any of a host of other things that are damaging to wildlife. These are the constraints. But in a fragmented environment, it's unlikely that any one property is going to be able to provide all the different types of water sources, all the different types of vegetative environments, and so on that diverse native wildlife need.