[Izzy Dunne]

something knew in advance that they would one day in the distant future have to fight off insecticides developed by a species that didn't even exist yet.

Sound like evolution in action, more likely.

The bugs more resistant to the insecticide were better able to breed. Same as the hand sanitizers makes for a stronger breed of bacteria, because the ones it doesn't kill become stronger.

[The Theophilus]

Sound like evolution in action, more likely.

Only if the bedbug "evolved" into another creature. What is "likely" is that there is a loss, not gain, in genetic information, a failure to produce an enzyme that reacts to the chemicals on the nerve endings - at least that has been the case in other examples of chemical resistant critters.

It would be like if you lost your hearing, you could then stay in an incredibly loud room without getting headaches whereas those who did have hearing would leave. Does this mean that you are "evolving" into a X-man?