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Recent events end elections (U.S.) have shown that people increasingly tend to believe that
Perception is reality.
In other words, emotions seem to have gained a lot more importance during the last months or years. For some, this is also partly the reason for the uprising of far-right movements such as the Front national in France, UKIP in Great Britain and the AfD in Germany.
I only know of the rhetorics in the U.S. and Germany, but in both countries we could see politically relevant actors (President Trump and AfD members such as Björn Höcke) often saying highly exaggerated, verifiable false statements. In case support for this claim is required, I refer to this article, with the English translation begin available here.
However, the number of people who still believe these falsified statements is not to be ignored and in case of Donald Trump is even said to be crucial for him becoming president of the U.S. The same goes with measures such as his aim to build a wall in order to prohibit illegal immigration from Mexico or the statements of AfD-leader Frauke Petry, according to which she would like to live in a country (Germany)
where boys and girls can go swimming without being fondled.
This is just one example for exaggerations not a few people tend to believe or which they connect to emotionally.
To conclude, we can see a rising number of people who believe transparently falsified statements (post-truth) or value the importance of emotions higher than that of facts. My question is if there are any important events or developments which might have accelerated the trend towards "post-truth" especially in the Western world.
Do note that this question is not country-specific, because we can see the trend mentioned above happening in many Western democracies. Also, please do keep it mind that this is a rather important topic not only but also because there will be major elections in France and Germany this year. Because of that, I would like to understand what brought not few people to the relationship between facts, emotions and politics we can see today.
In case there might be problems with the question not complying with the question requirements (aka "too broad" etc.) I will do what I can to change that.