I suppose a lot depends on your circumstances. If you are a hobbyist, then I understand the morals and would regard chilling insects purely for the photo as perhaps a step too far. If you are a professional, who's living depends on getting the images you have been commissioned to produce, then the boundaries are somewhat different. Do you put an insect at minimal risk by chilling it, or do you risk not feeding yourself and your family that month?
Many insects get killed every time you drive (or are driven) down a road, or use any form of public transport. Whilst such deaths are not deliberate, they are avoidable by walking everywhere. There is a balance between achieving your goals, whether it's getting from A to B or getting that photo, and the risk to other forms of life. All activities pose risks to other creatures and the creature performing the activity, it is up to each individual to decide where the trade-off lies.
Duncan
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