This is the purpose of courts, the purpose of peer review, the purpose of debate.
Ideally. But keep in mind: not for everyone, and it would be in the interests of those primarily concerned with power and manipulation to convince those concerned with truth and the greater good that this is the case.
I'd agree, in fact I'd say that in many cases finding the truth is not the first priority of most individual participants in those systems. That's why they're systems, and that's why concepts like integrity are so important and why the commitment to truth, honesty, and sincerity must be constantly reinforced.
Ideally. But keep in mind: not for everyone, and it would be in the interests of those primarily concerned with power and manipulation to convince those concerned with truth and the greater good that this is the case.