Attempted murder implies intent to kill.

I think it would be difficult to convince any reasonable jury that evading arrest comes with an intention to kill.

Law enforcement, being far more aware of the dangers involved. Being a professional organisation whose remit includes the safety of the populace. Is well funded. Has access to years worth of internal and external studies, and the advice of public and private institutions well versed in sociology, criminology, and road traffic statistics, should, in a fair world, be held liable for any manslaughter charges that occur in such a chase, rather than the chased.

But that doesn't fit with the narrative of "grr, dickhead criminal on motorbike made me feel angry" I guess.