Have you ever had someone tell you that a problem was nothing to worry about and you straight-up didn't believe them? Like, if the airport has me sitting on the tarmac for an hour and I have to dodge slow walkers while running to make my connecting flight so my bags don't take the trip without me, you can bet I'm worrying about it.
They might as well tell us that their dog is friendly right as it's snarling and foaming at us.
So yes, there are times where you're totally allowed to worry, and all of these situations are perfect examples.