Murder is premeditated.

First-Degree Murder

• Premeditated, intentional killings (like stalking someone before murdering them)

• Capital Crimes or Felony Murder

Second-Degree Murder

• An unplanned, intentional killing (reacting in the heat of the moment when angry)

• A death caused by a reckless disregard for human life

I’m not really sure if you are simply ignorant or being intentionally disingenuous. Either way, you are wrong. There are different counts & legal standards for those counts specifically because of the fact that not all murder is premeditated.

https://www.findlaw.com/legalblogs/criminal-defense/difference-between-first-second-degree-murder/