That would make no sense whatsoever. My point is not that 'you must punish the guilty no matter the consequences'. My point is that when weighing three people who carried out premediated murder against one innocent, I believe that imprisoning the three guilty will do more good than the evil of imprisoning the one innocent. Punishing the entire town would obviously do more evil than good.
I'm going to say no, because the landlord does have a reason that mitigates guilt. A landlord's duty, in the context of Roshar, is to decide how best to protect and care for his people. If the landlord has decided that the best way to do that is to execute an innocent, I don't think that's a heinous enough crime to justify executing him in return. I'm not exactly sure what should be done to the landlord, though I do think that killing all four men is wrong, but I would be in favor of options such as removal of title, imprisonment, or no punishment, depending on the details of the execution and the landlord's reasons for doing so. (If those reasons happened to be 'I hate hogmen' and the hogmen were drawn and quartered, I would reconsider the execution thing)