I think the top-level comment ("Might his squadron be called in to quash civil disturbance? Sent to the next Iraq? Is it reserved for defending the UK from invasion?") is exactly the kind of thing you should ask yourself when joining something like the Army Reserves. Everyone has some things they will not do, and it's important to figure out what those might be before finding yourself pushed to those limits.

The thoughtless comments basically express the idea that no one should be in any military, whereas thoughtful questions acknowledge that not everyone has the same red lines.