If you want to argue against veteran’s assertion of mesira based on that the alarm was waking him up, you need to state that in your defense.
Yes that, and the fact that a ticket was not his intention, nor a definite consequence.
I don’t necessarily know that it was muttar to call the police; what I am saying is simply that it would have to be vaday mesirah for the din of ??? ????? ??????, ??? to apply.