Negative thinking is basically just intelligence, the intelligence to see: “what is” false, “what is” based on conditioning, “what is” based on corruption, etc. Negative thinking is not the opposite of some coin (of thinking), it is not the opposite of positive thinking.
Negative thinking is the absence of thought, the absence of thinking. In the awareness of “what is”, there is no thought operating.
In positive thinking, all the thinking that is normally done by almost everyone is done through analysis.
There is the seeing (via intelligence) of positive thinking in almost every aspect of the world. In sports, as it is played in the Olympics and in all competitive activities, this is all based on positive thinking. Trainers use positive thinking to train their athletes. Politics uses positive thinking to get support from electors - the ever-growing economy (the yellow brick road), the emphasis on stats to buttress belief in how many jobs are available and whether everyone of the citizens are holding down jobs - jobs which enrich only a few people, which exploit the majority, which is all a horrid arrangement. Students in most schools are indoctrinated to think critically, to analyze, etc.; educators are indoctrinated to praise and encourage the intellectual, who is rewarded with lucrative jobs, careers, all so as to support exploitation, greed, and enrich only a few, the rest just struggling to provide for their basic needs. All of this is part of the general corrupt society in which we all find ourselves, which is to be seen and understood. And then there is politics, “my” party vs. “your” party, etc. And, positive thinking encourages so-called democracies to shout “Freedom”, which is nothing more than the licentiousness and wilfulness of doing and feeling physically free in one’s activities, with very little consideration of another’s reality, or of the limits of nature to support such activities (hence climate change, etc.). Positive thinking lies behind all the advertising from billboards to TV. Positive thinking encourages bullies in autocracies to support the strong man - leading to wars, encouraging power, misogyny, and generalized violence, etc. In organized religion, positive thinking encourages an emphasis on “my” religion vs. “your” religion, beliefs in things that aren’t real, beliefs in “god”, the “creator”, praying (the very epitome of positive thinking), all with a view to cut the edge off of the general suffering of so many, giving psychological comfort, etc. - all of which results in the separation of one from understanding one’s own sorrow.
All of the above supports division. And the worst problem with positive thinking is that it makes it rather difficult or even impossible for anyone so indoctrinated and believing in the validity of their lifestyle to even consider possible something called negation (especially when they have only been operating with positive thinking for years and years). And that is because people like that view anything that is different from what they are accustomed with to actually do negation, because they assume and see everything as just what they are - just full of different opinions, which the so-called democracies encourage and support.