Yes the US seems to be breaking away from the agreed norms for resolving conflict.
At a nation state level as well as at the militant organisation level it does seem as if the aspiration that humans have shared values, codes of behaviour and affinity for each other because we belong to one human family is not an ideal that can be realised. Even values such as abiding by a rule of law and recognising that there must be some organisation to arbitrate between entities to avoid escalating violent conflict - and changing the law or the entity's method of operation if it is flawed - seems to have been abandoned by some governments. Hopefully a change in government will bring about a change in attitude, though I doubt any government is going to give away any significant power to another entity.
There seems to be a sizable number who prefer to reject the institutions that try to foster a human "family". Short-term self-interest overrides any long term considerations of international stability through adherence to common rules, and as the UN is seen as a political entity that makes political decisions e.g. not recognising Taiwan but recognising China, some people seem to have lost faith in its judicial system, not just to be fair but also to protect individuals from harm.
The belief in the idea of a human family is even less feasible when we don't even seem to be able to agree on the ethics of use of force during a military conflict - some people believe torture can be justified if it saves lives and others don't. Or some agree with the use of economic sanctions in place of military intervention and others don't, since sanctions shift the harm mostly to the civilian population, including the deaths of thousands of children through malnutrition and lack of access to medicine.
