During the World Wars, we used to fight openly and hate and bloodshed. Millions ordinary civilians lost their lives in the battlefields. That got exposed over the decades and everyone realized, only losers are people and not the rulers. Rulers thus lost power to engage people into war.
That resulted in Cold Wars era, and all fightings became covert. UN, diplomacy, spy agencies, destabilization, psyop, disinformation, false flag attacks, proxy wars, economic warfare, electronic warfare, etc.
All of that got exposed as well, through time and thanks to the whistleblowers. Rulers started to lose backing of people again, for such covert tactics, for the same objective of fighting. Now, it seems, the establishment is taking the route of overt fighting again, arousing hate and justifying it as a necessary evil, as both overt and covert tactics were exposed in the recent history, going back to overt, since many have forgotten history, and we see people falling for it. The values we learned over the centuries are being brought into debate again: bigotry, racial profiling, intolerance, divide and conquer, world wars on boundaries and nationalism, forced laws, building walls, ethnic cleansing, fighting based on religions, disrespect, fascism, etc.