This discussion is rapidly running in the wrong direction.
While I do not share the admonition of some that it is "taboo" to speculate
about causes of an airplane accident before all of the factual information is
in, it is certainly unhelpful and disrespectful to start crying "pilot error"
and lamenting all of the things they should or should not have done, before any
of the salient facts of the scenario are in place. Similarly, it is reckless to
start decrying insufficiencies in any of the aircraft's systems or their use
without a solid factual basis for these assumptions.

It may be useful to discuss airframe icing and tailplane icing, and it is
perhaps pertinent to speculate about its role in the current case, but to go
much further can only foster misunderstanding and misinformation. Have instead
some respect for the people who lost their lives, and for their families, as
well as for the flight crew who just may have known a thing or two about how to
fly their airplane. . .