@Wise_A
The basis for all modern case law in the U.S. relating to police use of force is the U.S Supreme Court decision in Graham v. Connor, 490 U.S. 386 (1989).
If you want to speak about LE use of force in any meaningful way you need to be familiar with this case and it's application.
Graham was a United States Supreme Court case where the Court determined that an objective reasonableness standard should apply to law enforcement use of force in the course of making an arrest, investigatory stop, or other "seizure" of a person under the 4th Amendment.
The Court then outlined a non-exhaustive list of factors for determining when an officer's use of force is objectively reasonable, commonly known as "Graham factors" the first of these factors was "the severity of the crime at issue,"
So while any encounter can escalate, " What he was being investigated for" is material to the discussion.