In general, a scaffolding of mental rationalizations is constructed. Happens a lot. And generally, it isn't completely black and white; in this case, roundup has benefits to humanity as well as risks and costs.

Further down, we have PR firm controlled "sock puppets" discussed. Certainly a reality on the internet and HN.

In my view, a sign that discussion of a given issue being influenced by a lot of PR dollars/industry propaganda is an excess of emotion. The emotion is a side effect of all the propaganda, as invoking strong emotions appears to be necessary to influence people using PR/propaganda techniques.