A lot of snow is not surprising in Minny and a building has to be built to handle it.
You really have no idea what you are talking about. We got 17+ inches, which is the 5th most on record for a single day. Virtually everything shut down yesterday, and plows had been pulled off the road until 2am this morning. This was not a regular snow fall.

Great, so it was the 5th-largest snowfall on record....which means that 4 other times in, what, the last 100 years (??) we would have seen the roof collapse. Bri's point is that if you build an indoor stadium in Minnesota, part of the design spec needs to include ability to withstand unusually large snowfalls....because it happens. As you yourself noted, 4 times in history (which again, probably only goes back ~100 years) it has snowed EVEN MORE THAN THIS.