Meet a Scientist: NHM Entomologist Elizabeth Long 

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The amount of insects killed by researchers is minimal compared to the amount of insects killed by pesticides and other toxins. If you're suggesting researchers are responsible for insect decline, I recommend you do further research. There are many reasons why entomologists have to kill insects for research, mainly to do with the fact that their population sizes are so large and the insects themselves are so small. It's not feasible to tag and release insects the way we can larger animals - the technology needed has to be so tiny as to not weigh down the insect. Additionally, the number of insects needed is far too large for tagging to be feasible. Some larger animals can have characteristics that makes different members of a population easy to distinguish, but it's impossible to do so with insects. Also, differentiating between insect species almost always requires a microscope, and it's much easier to identify dead insects than live insects. Researchers don't love killing insects, but when the animals you research are so tiny it's a necessary part of research.