"Just because someone exercises critical thinking does not mean that that person will come to the same conclusions you have."
Well, perhaps not. But I think it's very reasonable to guess that a group of critical thinkers will be able to agree that a serious problem is, in actuality, a serious problem, and will be able to recognize, individually and collectively, that a given existing situation is unacceptable due to the seriousness of a serious problem. The solutions that they propose will undoubtedly vary based on group members' experience and goals, but I like to believe that the solutions that critical thinkers offer, while varying, will be offered along with the reasoning leading to the solution, and that the reasoning can be accepted or rejected in predictable ways based on the beliefs of the members of the group. Thus, groups whose members have similar beliefs and high-level goals -- say, "conscious beings have a right not to be arbitrarily killed, or killed for the pleasure of others;" and/or "approaches that reduce every individual's suffering while also reducing the average individual's suffering are to be preferred to approaches that fail this test" -- will be able to converge on solutions acceptable to most members.