It's true that putting locks on your front door will reduce the chance of your house getting robbed, but if you do get robbed, the fact that your front door wasn't locked does not in any way absolve the thief for his conduct.

Similarly, if an organization deploys a public system that engages in libel and tortious interference, the fact that jumping through technical hoops might make it less likely to be affected by that system does not in any way absolve the organization for operating it carelessly in the first place.

Just because there are steps you can take to lessen the impact of bad behavior does not mean that the behavior itself isn't bad. You shouldn't have restrict how you use your own domains to avoid someone else publishing false information about your site. Google should be responsible for mitigating false positives, not the website owners affected by them.