I disagree. “Pulled in front” could easily mean merged in turn. If the four in the pickup chose to, they could have been trying to budge forward out of turn.
There is not nearly enough information to draw such a conclusion.
It was a road rage incident, escalating and leading to a fatal confrontation. If you want to think he politely merged in front of those guys, you’re certainly free to do so. But, the circumstance points to cutting them off.