RebE: If the information entered into a computer is not reliable, the information received after its processing will also be unreliable.
Not always. If information is noisy but unbiased and multiple pieces of information are independent, then by Central Limit Theorem, average estimate will converge to a normal distribution with variance decreasing linear with number of independent pieces of information. Thus, meta-analysis of multiple legit independent studies, each with different flaws, is better than each of them separately.