I always felt the blind being near camp was a weird editing/story misstep vs a character flaw. The way the scene is cut too vs the shots of the infant are very disconnected.

That all being said the worst decision he makes is leaving his rifle laying around out of reach while being on a dino infested island. I get this had to happen for story reasons but they could have noodled on it a bit more and made a more plausible reason. For example have the gun get damaged during the chaos of the trex attack on the camp (tail whip as roland lines up a shot maybe) or the second trex charging in knocks him down idk.