What do you think are the reasons why people need to have or to apply any type of propaganda technique to persuade or convince?

Explanation:

Propaganda became a common term around America during World War I when posters and films were leveraged against enemies to rally troop enlistment and garner public opinion. Propaganda became a modern political tool engendering goodwill across wide demographics and gaining the favor of the country

Lying and deception can be the basis of many propaganda techniques including Ad Hominem arguments, Big-Lie, Defamation, Door-in-the-Face, Half-truth, Name-calling, or any other technique that is based on dishonesty or deception. For example, many politicians have been found to frequently stretch or break the truth.

can i see the painting?

i think the answer is second