Yes. And there is nothing to stop bias from informing any other development of theory because bias is part of the interpretation of data.
We would like to think that we are or will get better at eliminating for bias, but that seems to be much more of a faith statement than a conclusion based on the evidence.
Both. Science provided the data to justify the adjustments or additions, but things like social and political pressure always inform our decision making.
Maybe we can argue that you average scientist is quite a bit more intelligent than you average non scientist, but I do not for a second believe that anyone ever just follows the fact to where they lead in any decision making process. I do not even believe that it is possible to do so. I think it goes against how we evolved and the way the need to survive our immediate environment actually makes being detached and rational counter productive up until very modern times where we have had the leisure to do so.
I agree with this, but that doesn't exclude all the genuine corrections to genuine mistakes, either from errors in the data collection process or in the interpretation of the data.
I am simply saying that the scientific method is not necessarily perfect, if for no other reason than the limitations of those practicing it, but that doesn't take away from it being the best option we have for many things right now.
I don't even see how this view is controversial.