From the Wikipedia article on Stockholm Syndrome

However, according to accounts by Kristin Enmark, one of the hostages, the police acted incompetently, with little care for the hostages' safety. This forced the hostages to negotiate for their lives and releases with the robbers on their own. In the process, the hostages saw the robbers behaving more rationally than the police negotiators and subsequently developed a deep distrust towards the latter.[6] Enmark criticized Bejerot specifically for endangering their lives by behaving aggressively and agitating the captors. She criticized the police for pointing guns at the convicts while the hostages were in the line of fire, and she told news outlets that one of the captors tried to protect the hostages from being caught in the crossfire. She was also critical of prime minister Olof Palme, as she had negotiated with the captors for freedom, since the prime minister told her that she would have to content herself with dying at her post, rather than Palme giving in to the captors' demands.[7][8] Ultimately, Enmark explained she was more afraid of the police, whose attitude seemed to be a much larger, direct threat to her life than the robbers.[9] Enmark spent decades maintaining that she had no affinity for her captors; she only did what it took to stay alive during the ordeal.[10]

Olsson later said in an interview that he could have easily killed the hostages in the beginning, but over time it became more difficult, as he developed an emotional bond with them:[9]

It was the hostages' fault. They did everything I told them to. If they hadn't, I might not be here now. Why didn't any of them attack me? They made it hard to kill. They made us go on living together day after day, like goats, in that filth. There was nothing to do but get to know each other.

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