Drones are easy to jam. The communication link and GPS are most obvious targets.
This is going to be a major problem for the golf industry. It's the ideal target environment - high-value targets, no place to take cover.
[1] https://www.uavnavigation.com/products/ahrs-imu/polar-300
Imagine a drone being so sophisticated that it can calculate the sniper shot gunning for you and can even deflect the bullet or take the direct hit for you. Same for suicidal bombs. If the enemy drone explode on impact, your drone can kamikaze theirs.
The economics of defence are such that kamikaze anti-drone drones won't work. Either they'll miss the vast majority of the time, or they will be hideously more expensive than the drone they're defending against.
Star-Tracker Algorithm for Smartphones and Commercial Micro-Drones -https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7070887/
The short distance drones can travel is a big problem, you can backtrack to the launch location.
Committing murder for money is mostly unheard of outside of Hollywood.
It happens but it's generally somewhat crazy people or people copying Hollywood. This is more the real reason it wont happen. Society doesn't like murder and will pull out all stops to discontinue it.