No amount of Legislation wiill stop a determined Criminal - by definition Criminals break the Law !
Comparisons with Bird Strikes are flawed - Birds don't have built in Power Sources - with their associated explosive risks.
IMHO the only real answer is the use of Technology to either prevent Drones from operating in and aorund Airfileds,
or to interrupt their flight ( whether this be Signal Jammmg, or a more physical form of intervention ) to bring them down,
where they can be forensically examined with a view to identifing the culprit(s).