only the mainstream media knows about this? Quite odd to qualify media this way here, when most of all media uses this mechanism. We also forgot politicians who are experts in this field.

Ctrl + F "only" is only in your messaging not mine. I never said they were the only ones doing this? It's not just politicians, celebrities know about this and will use it to their advantage. Whoever makes the headlines first might have a stronger sway over their adversaries. I'm not even poking at any side in particular, this is reality across the board unfortunately. People will just blindly take and believe the primary headlines.