also why ambulances don't normally blast through red lights.

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Ambulance was totally at fault.
The lights and sirens give them the right of way at a lights but doesn't give them license to completely ignore them. There was no way the biker could have seen or heard the ambulance there.

While I agree with you, you also have to check local legislation. Around here, if you collide with any emergency vehicle with its lights and sirens on, you are at fault.

And yeah, that ambulance driver was totally reckless.

There's being right and then there is being dead right.

Neither really applies here. The motorcyclist simply couldn't have heard / seen the ambulance in time. When you have a full face helmet on, your sound intake is muted. Not silent, but with the ears being covered and wind around you.. it's basically like being deaf to anything not in your immediate vicinity.

This is the EXACT reason that almost all emergency vehicles (at least locally) even with lights and siren blaring will slow right down at an intersection to make sure they aren't going to get clobbered.

At least he didn't have to wait for an ambulance!

I don't know what the law is elsewhere, but in NZ, emergency services are allowed break red lights, but they can't be travelling faster than 20kph (~12mph).

The only possible reason for an ambulance to be travelling that fast was if the patient was on the verge of death, and now you've delayed getting them to the hospital even more....