The white car isn't in a position to GIVE anyone space. The merging car either has it or they don't. They did not, and they changed lanes into another vehicle anyway. The white car cannot be at fault, because aside from speeding, they were just driving in a straight line.

"Changing lanes" is also a seriously generous description of what the grey car was doing. They were charging lanes, tailgating, going much faster than the rest of the traffic on the road, and ignorant of their blind spots.