There sure is a lot of R&D and money being spent in the name of "safety". How many consumer UAS have actually hurt someone? The idea of anyone being able to see what you're up to that concerns many in power and they're using the guise of "safety" to fund these anti UAS tools.
Case and point, NCAA football doesn't care about a UAS falling and hurting someone, they care a lot more if someone launches a UAS and films the game in progress. That's why they're spending top $ to fund these devices, the mighty dollar is their true motivator.