This allows them to avoid simply killing each other(too risky) while still allowing credible threats to power, and gatekeeping contenders who won't play by the same rules. "Civil" society is an expression that alludes to making that ruleset ethically responsible and cooling down the competition. It's tested constantly by anyone who wants to get ahead.
The behavior is everywhere once you look: If you have a poorly regulated sport, match fixing, cheating, dangerous play, and exclusionary collusion all become rampant. If you have a labor force with few protections and high competition, they start to climb over each other to pump up their image. And when organized crime structures break down, violence erupts.
Democratic structures, coalition-building, collective bargaining, and other tactics that negotiate rights and protections solve most of these issues temporarily, at least until a majority are satisfied enough to stop participating, by which time someone ambitious will have found a new angle for changing the rules.
If it feels like this era is more unstable or more violent, it's because there are some very broad changes hitting. Disruption worked.