Unfortunately, recently it has become a norm. What is not normal is to have severe human rights violations like summary executions.
In Mexico, based on publicly available information, we have an index of lethal activity by the armed forces. The navy kills 34 civilians for each member of the navy who dies when there's a conflict. With Sedena, there are 19 civilians who die for each member of the national defence force.
We see that there is this new practice of summary executions of civilians in Mexico. In the Tlatlaya case, we have an example that shows what's happening.
International organizations that defend human rights, like Human Rights Watch, have spoken out to say that it is necessary to have an independent investigation of what happened in Michoacán. Until that, there will be no certainty about what actually happened.