I'm not sure the "guilty until proven innocent" applies in the UK - suspension isn't about guilt or otherwise, it's to ensure there's a proper investigation to establish what happened & why, & to ensure they have time to recover from the shock & trauma of it, & are fit to return to duty. If there are failings in the way the crew operated the aircraft, that may be addressed with retraining; if it's a technical issue, then that's no reflection on them, anyway.