Target got what was coming to them
Target has all the symptoms of a corporation entirely under control of bean counters who don't know the business and who are addicted to cutting corners and making false economies,e.g. inadequate security of their IT systems.
But also this: everyone has probably heard by now of Target's failed entry into the Canadian market. After just two years, they've completely shut down and gone back to the US tail between legs. From personal experience I can testify that whoever was in charge of the Canadian stores didn't know the business, cut corners, and chased false economies. For the first time, Target had two-level stores. The dimbulb(s) who designed them put the men's clothing on one floor, the women's on the other, but only put change rooms for trying clothes on the floor with the women's wear. Perhaps it saved some money on construction, but I'm sure I wasn't the only man to simply walk away when I found out I had to trek to another floor to try on the items I was thinking of buying. The Target-in-Canada stores I visited seemed to be laid out entirely for the benefit of the company, not the customers. (The change room fiasco is merely an example.)
Given the boneheadedness implied by the Canadian store designs, it comes as absolutely no surprise that Target would have also skimped on IT.