You can blame someone in many ways, doing it on a DATIX is no different to any other. It's not dangerous at all, the system is a vital part of a safe culture within the NHS. Most places explicitly state you do not name individuals in DATIXs as it is not about blame but about addressing risk/improving care. To say that it simply should be scrapped is just nonsense. I'm not sure you understand how it is used.
Matron's may have checked everything a nurse did, and that has it's place, but the old school matron was part of a rigid hierarchy and a culture of fear, which caused plenty of other problems. Saying Matron's replace a system for recording and addressing risk and poor care doesn't wash.
Most places have recognised that rigid hierarchy isn't a healthy way of working (although we may have slipped too far the other way now). There absolutely is bullying at all levels in NHS, highly trained doctors/nurses are all perfectly capable of bullying even in this day. It's not stupid to be aware of that.