It has been well known that the sun varies in output. Was it lack of information or disregarding the known in this case?
Individual scientists can corrupt input variables or outright lie and make stuff up for their own purposes. Happens all the time. Classic case is Andrew Wakefield who published his infamous 1998 paper in The Lancet linking vaccines with autism. He was proven a fraud and I believe was actually imprisoned but to this day Jim Carey and other celebrities swear by his research. Muslims in Pakistan took it a step further and have murdered scores of medical workers trying to vaccinate against polio who they believe are trying to sterilize Muslims.
How many have become sick or died because of his fraudulent research it is unknown but again.....what is closer to the truth eventually comes out.