Just the one airfield? Not necessarily a miscalculation - it will depend on how the rules shift.

But it does mean that there can only be escalation from this response; inconveniencing the Syrian air force every time there is a high-profile chemical strike or crime against humanity (and no more) would get boring fast. Sisyphean slope, and all that.

So this would be rather useless as an isolated act, but by the same token putting it out as part of a potential system is what makes it risky.