There is no agenda, you are reading way too far into what he said. You're trying to call him a ***** and that's completely uncalled for. He made no assumption, he merely suggested that language may have played a role in the accident. You pushed him to defend that position, he told you look it up. You did, found nothing and came back to tear his head off when once again he did not expressly do anything beyond speculate.
Just because the driver hasn't admitted he can't read English well doesn't mean it's not true. It merely means it is not confirmed. You continue to insist on there being an agenda when a language barrier is a known problem in the industry. Four people died because a driver failed to do what he was supposed to. Why are you arguing about the why when there is no good reason for it? What are you defending, exactly? A properly trained driver knows what to do in the event of brake failure. This driver didn't do that, and was so terrified of dying that he closed his eyes before impact. A trained driver would be looking for a way out right until the last moment, and I speak as someone who is still alive thanks to that training.
This driver was not roadworthy. Stop arguing about why when it's pretty clear that regardless of if it was poor language skills or poor training this driver was not properly qualified. Four people are dead, stop defending the man who killed them. If the brakes were out of adjustment, that's his fault. If the brakes were on fire, that's his fault. If the truck was overweight, that's his fault. It doesn't matter why he killed four people because it wouldn't have happened if he'd done his job right.
Drivers plowing into cars is becoming alarmingly common and it's unacceptable. We should be united in condemning accidents like this and the drivers who cause them instead of arguing over something stupid like the rising number of immigrants driving trucks. We all have our opinions on that, but it doesn't change that all drivers should be capable of avoiding a situation where they kill 4 people due to brake failure. Proper training and education, period.