Which European (EASA, EU) regulation corresponds to US FAR 91.13 on "careless or reckless" operation of aircraft?
This is covered by SERA.3101 (Page 19) for the UK:


  SERA.3101 Negligent or Reckless Operation of Aircraft
  An aircraft shall not be operated in a negligent or reckless manner so as to endanger life or property of others.