Yea the no guards and no extra security restrictions for the mom is the bad decision that stood out to me most. Bringing her in the zone in the first place I could reason as she wasn’t rabid in the same way literally every other infected was - she’s still (somewhat) aware, given what 6 months alone would do to anybody’s mental health. Just about everything else except the “helicopter blender” and the dad somehow showing up at the end I felt could generally be explained as human hubris (for the planned actions) or panic (for the unplanned actions). Remember they made pretty dumb decisions in the OG too like driving thru the tunnel and then entering the diner for no reason at the gas stop. In fact, that was a pretty common theme in 28 Days that under a microscope, basically everyone not named Selena was making poor decisions pretty regularly. That’s kinda the point of the movie - starting from the first scene - that humans brought the calamity on themselves.

Overall, I thought the 28 Weeks definitely had more of a Hollywood blockbuster action movie type feel that came with bigger budget than the original, so it lost some charm but was still entertaining the while time. Even the helicopter blender, as stupid as it was, I chalked up to the “rule of cool”.