This aircraft situation is nowhere equivalent to the Citroen/Beatle situation. The aircraft uses bleed air bled from the compression section of the engine. Unlike the air in the automobiles you cited, the aircraft air is nowhere exposed to exhaust air nor engine components exposed to combustion. In piston powered aircraft (and even some turbo prop aircraft) cabin air is supplied by an engine driven compressor. On 787 the compressor is driven by an electric motor. Those compressors are functionally no different than the compression section of a turbine engine and no more nor less safe.