Okay - then here's a question for you:
1) How do you normalize this idea with the fact that humans can, under the right conditions, see infrared:
http://io9.com/under-the-right-conditions-humans-can-see-infrared-1665448040
2) What do you do to normalize this outside of the human species? For example:
Several animals, including beetles, bed bugs, vampire bats, and pit vipers can detect the infrared spectrum:
Other animals, notably birds, can detect the ultraviolet spectrum.
It seems like your argument is based more around the human perception of "light" which is visible light by connotation. There is, of course, the potential for em radiation in the dark - however, there are situations where thermal (infrared) goggles will not help, especially if they have less than top-end sensors - for example, infrared security cameras typically add a set of infrared LED's around the camera to "shine" light upon their viewing area.
One could argue, though, that there is always some kind of radiation, be it from radioactive decay to cosmic background noise.