[Canada] Easily avoidable accident causes rollover

Not my video – as the title says, we typically see examples where one driver is oblivious to the other. In this example, the pickup truck attempts to overtake the cammer, however, the cammer is either completely unaware of the pickup truck directly to his left or are simply “stands their ground” in the lane. Due to this, they obviously collide, and the pick up truck goes airborne and rolls several times. From the perspective of us, the viewer, we can reasonably conclude that the accident was avoidable had the cammer simply applied the brakes. That being said, you will typically see another school of thought in which it is stated that the cammer has no obligation or duty to let them in/avoid the accident where the driver is mindlessly doing something dumb.

What do you think? Is this shared fault, shared liability? Or is the pickup truck the only one wrong here?

Video: https://youtu.be/yq8oQJdbayw?si=1VsoDwjFiY6KOAFh – first clip.