I believe the evac. was an over reaction, on the face of the available story, and expensive for airlines to continue doing unless they are really required.
I am glad you can read enough into this to criticise the crew.
I cannot see anything in the story above to even begin to indicate whether the crew were, or were not correct. No mention of the problem, condiditons, indications internal or external, communications, or company or authority SOPs / regulations.
I hope if I have any incident, you are not part of the investigating team...
NoD