You're basically saying "I cannot, in any way, imagine a situation where the parent's story is the sensible choice, and therefore I'm entitled to make a pedantic comment about a situation I wasn't in". Instead, you should give them the benefit of the doubt.
I didn't say it was wrong. I said a cart should make it easier. I'm legitimately confused by their partial explanation, not being pedantic. It's fair to want clarification about why a cart doesn't solve this.
Maybe there are no carts at this store for some awful reason. Maybe the story was so focused on how this type of key solved their problem that they didn't give a fair shake to other possible solutions. More information is needed.
There are multiple ways I can/do give benefit of the doubt, but doing so doesn't make the situation any clearer.
