I changed my kid and left the diaper in the middle of the store's kids section
Why would you leave a dirty diaper?
I was in a hurry at that time.
It is wrong to leave dirty diapers in the middle of a store. A kid could find it and play with it or get sick from it.
Sorry, but I was in a rush.
That isn't an excuse to not pick up after yourself. Be considerate of others around you.