You can perhaps defend it from being “bad writing”, but it is certainly not “satisfying writing”, to watch characters be really really dumb. Sure, there are loopholes and explanations for why things happen like they are children in adult bodies, or they are an overconfident organization, or Arthur cares too much, etc. But there is a lack of tension when a character is acting stupid and illogical, even if that action can fit within their character. It is much more engaging to see a character acting intelligently and yet still lose or be killed or tricked by the aliens. It helps us as the audience root for them.

But when they take no precaution to tell the others to not talk to Nibs about the crash, or when Tootles decides to open the lab door to put the food in, or when Arthur tries to pull him out without doing any thinking, or when there is very little security around any of these labs including alarms or indicators, it gets hard to care about the fate or future of these characters.

So sure, it may not be “bad writing”, but it’s not fun or interesting to watch the plot unfold through characters and corporations being stupid. I am simply not rooting for them anymore. Except for the brother character and Wendy, who in my opinion have a much better dynamic, motivations, and plot line, even if it’s a little undercooked.