Determined from someone sitting at a keyboard in their Mom's basement, no doubt.
The tanker is a floating bomb and is a new weapon of choice.
Crude oil isn't an explosive, and I don't know of a single instance of a crude tanker being used as a weapon.
Anything that comes ram-speed towards our ships should be sunk first and ask questions later, especially in hostile zones.
You have no idea what the Tanker's speed was or whether it had "turned toward" the destroyer; it well could have been five knots.
And as collision avoidance, "sinking" an approaching supertanker is physically impossible, especially for a Destroyer. The best decision is to stay out of their way.
So I ask for about the millionth time - what motivates people to post about subjects they don't know anything about?
They feel an overwhelming drive to announce to the universe that they failed Physics?