A bad solution is still a bad solution. And vigilanteism is still vigilanteism. And DDOS attacks using infected devices are nothing new, it is just that IoT have opened up a new attack vector. Look at how many Windows based computers have been involved in DDOS in the past.
Yes, it's a bad solution, and it's undeniably vigilantism as well. But, like democracy, it's still the best (and at present, only) solution we currently have that is working at scale. The Zero Day Initiative typically gives vendors 90 days (3 months) to fix a problem before they go public except in exceptional circumstances, and most credible vendors are OK with that framework. By comparison Mirai hit almost six months before BrickerBot, Hajime, and other such tools were unleashed, and in all that time noone - whether vendors, ISPs, or owners - did much more than shrug, shuffle their feet, and wring their hands.
They collectively took a huge dump in everyone else's bed and then did nothing about it, so that just left people stepping up with their bad solutions and vigilantism to try and clean up the mess. Want to "fix" BrickerBot and Hajime, etc.? Fix your devices, secure your networks, and isolate your devices, as applicable. Just like Mirai and the rest, if they can't root the device, then they can't propogate either, and everyone benefits - in fact, unlike the blackhat authors of malicious botnets, the vigilantes are more likely to shut up shop as soon as there are credible signs of progress being made. Acknowledging the message they are sending is all that is required.
Level of female education is the strongest predictor of birth rate. But educational attainment in general is limited by conditions of extreme poverty.