May be I am missing something...
1. The safety of the flight, including the decision to begin an approach and to land lies with the crew, not the ATC. Airlines have their own minimums, certified by the FAA or the equivalent agency, and it's based on many things such a/c equipment, pilot training to name a few. Controllers probably don't have that info especially if there are hundreds of airlines with the mixed fleet operating in and out of the airport. Nor can they deny landing to someone because of that.
2. The precision to stay on the glideslope and the localizer lies with the crew, NOT the ATC.
3. The primary responsibility of the Air Traffic Control is a/c separation. PERIOD! And that's only in the in controlled airspace. They don't have to and sometimes don't have the ability to separate IFR and VFR traffic simply because they don't talk (and control) VFR a/c. They might not even have have a radar equipment (e.g. South America) and in that case rely on position reports only.
4. ATC have to make airline crews aware of the current weather conditions at the airport, including rwy conditions, notams, etc. They did do that.
IMHO, ATC did everything they were supposed to do. When the crew decides to attempt an instrument approach with conditions BELOW landing minimums and then willingly descends BELOW the Decision Height, then you can only scratch you head and wonder.
It is an easy sell to blame the ATC for the ignorant flying public who thinks that Controllers fly airplanes. That's what Polish side is trying to do.