As you know from your science studies, part of the scientific method is to formulate a hypothesis then test it. If valid, not only will the test indicate the hypothesis is true, but the test will be replicable.
It works the same in psychology; formulate a hypothesis about a person's behavior, make a prediction based upon that hypothesis and then see if it bears out.
Stable people are all fairly predictable within normal limits. An example would be that most people are abhorred by the DCA crash and now the Philly crash. They understand these things happen and seek to find a solution to prevent it from happening again. This endeavor requires research to find out
all the root causes and, therefore, some patience.
Unstable people are predictable within a range such as floating a conspiracy theory, mentioning buzzwords like "Trans" or "DEI". MAGAts, being inherently unstable like their Orange Jesus, react differently to similar events. In the case of the DCA crash, it's immediately blaming women, DEI, transwomen, blacks, etc. In the case of the Philly crash, they are blaming Mexicans and praising the same medical system they condemned during COVID*. They can be predicted to come up with some stupid, irrational reasoning for a disaster to provide immediate satisfaction as to the cause.
*being irrational such as condemning something when it suits them and praising it when it benefits them is part of being unstable.