My thought is: if the process is followed properly there is very little risk of these chemicals being in the end product, but if a mistake is made, they could be present in levels that may have some negative health effect. However, if the water or co2 processes were screwed up, the only risk is caffeine being present, which is not ideal, but not as bad as those chemicals. We all know mistakes happen, which is why I'd rather go with a process that has less negative outcomes from a mistake.