I think developing defense mechanisms against Slaughterbot attacks is a good idea, because certainly they will happen sooner or later. If the best defense mechanism is killing the ones launching the attacks, we will see several significant consequences:
1. Power will only be exercised by the anonymous and the reckless; government transparency will become a thing of the past. If killing the judge who ruled against you, or the school-board member who voted against teaching Creationism, or the wife you're convinced is cheating on you, is as easy and anonymous as buying porn on Amazon, then no president, no general, no preacher, no judge, and no police officer will dare to show their face. The only people who exercise power non-anonymously would be those whose impulsiveness overcomes their better judgment.
2. To defend against anonymity, defense efforts will necessarily expand to kill not only those who are certain to be the ones launching the attacks, but those who have a reasonable chance of being the ones launching the attacks. Just as the Khmer Rouge killed everyone who wore glasses or knew how to read, we can expect that anyone with the requisite skills whose loyalty to the victors is in question will be killed. Expect North-Korea-style graded loyalty systems in which having a cousin believed to have doubted the regime will sentence you to death.
3. Dead-Hand-type systems cannot be defended against by killing their owners, only by misleading their owners as to your identity. So they become the dominant game strategy. This means that it isn't sufficient to kill people once they are launching attacks; you must kill them before they have a chance to deploy their forces.
4. Battlefields will no longer have borders; war anywhere will mean war everywhere. Combined with Dead Hand systems, the necessity for preemptive strikes, and the enormous capital efficiency of precision munitions, this will result in a holocaust far more rapid and complete than nuclear weapons could ever have threatened.
While this sounds like an awesome plot for a science-fiction novel, I'd rather live in a very different future.
So, I hope that we can develop better defense mechanisms than just drone-striking drone pilots, drone sysadmins, and drone programmers. For example, pervasive surveillance (which also eliminates what we know as "human rights", but doesn't end up with everyone inevitably dead within a few days); undetectable subterranean fortresses; living off-planet in small, high-trust tribes; and immune-system-style area defense with nets, walls, tiny anti-aircraft guns, and so on. With defense mechanisms such as these, the Drone Age should be more survivable than the Nuclear Age.
But, if we can't develop better defense mechanisms than killing attackers, we should delay the advent of the drone holocaust as long as we can, enabling us to enjoy what remains of our lives before it ends them.