"I am stronger than you, therefore, I make all the rules." This very simple aphorism can be used by a character of virtually any level of intelligence. Whether it's the thug with a club or a super genius with a Kill Sat, it is the same. Their power justifies whatever it is they do.
Remember that physical strength is not necessarily the determinant here. Monetary wealth, political power, and just about any form of bullying can take the place of this. (Not that any professed adherent to this will necessarily admit it; the bully who uses physical strength may regard an ambush or other clever plan as cheating.)
This is Truth in Television to a certain degree for the vast majority of human history, including today; you can be the most righteous and incorruptible person in the world, but that won’t stop any bully or tyrant from doing whatever they please as long as they’re stronger than you. This doesn’t make them right, it just means that the righteous also need might to back up their righteousness so the bad guys can’t walk all over them.
Fortunately for those of us living in Real Life, the whole idea of Knights In Shining Armor, True Warriors, and "Comes Great Responsibility" is to espouse and encourage the virtuous use of power. The truth is that "Might" is a weapon like any other: its effects depend on who wields it. It is possible to use might for good. Unfortunately this often still puts those who are weaker at the mercy of those with power, who can only hope that they use it justly.
War, however, is extremely expensive, both in terms of actual money and in terms of human lives, and tends to leave both sides the poorer for it, which is why people are generally encouraged to settle conflicts with something other than their fists.note This is where the "violence is evil" underlying assumption comes from: someone who resorts to violence must be too stupid to use any of the more peaceful conflict-resolution tools. Or worse, are actively looking for any Pretext for War because they know they'd lose in a peaceful conflict resolution. People and countries are often more than happy to use it as long as they're the ones with the power, but complain when it is applied to them.
Fictional characters taking this trope seriously can lead in all sorts of more specific directions:
- Appeal to Force
- Asskicking Leads to Leadership
- Blind Obedience (from everyone weaker)
- First Rule of the Yard
- Gunboat Diplomacy
- Large and in Charge
- The Ludovico Technique
- The Perry Mason Method
- Rank Scales with Asskicking
- Rape, Pillage, and Burn
- The Right of a Superior Species
- Screw the Rules, I Have Connections!
- Screw the Rules, I Have Money!
- Screw the Rules, I Have Supernatural Powers!
- Screw the Rules, I Make Them!
- The Social Darwinist
- Torture Always Works (overlaps with Appeal to Force)
- Virtue Is Weakness
- Written by the Winners for historical cases.
Opposite hero trope:
- Right Makes Might: Good always triumphs! (Though some characters try to invoke this trope as a means of justifying their own Social Darwinist tendencies.)
See also Appeal to Force in Logical Fallacies. The Hedonist, when they are a powerful character, will usually use this logic. Related is Mutually Assured Destruction, when both sides are so powerful that peace is maintained precisely because both sides are too mighty to fight without destroying everything they were fighting for.