Shoreham airshow pilot acquitted

[Alsatian]

BBC News - Shoreham Airshow pilot acquitted over deaths
http://www.bbc.co.uk/news/uk-england-47495885

I struggle to understand how/why he's been found not guilty of manslaughter, when it's been proved he was flying too low and too slow?

If it were a motorist, who had been travelling too fast and recklessly, would he be found not guilty if he crashed and killed people?