I fully understand your frustration, I would be furious too. At that stage the seedlings or seeds need watering and care, which is not a big thing as it can take up 10 minutes a day. I don't what to criticize anyone, but no matter how busy you are, you can spare 10 minutes. After all it is for your future food.
I hope you can convince them to be more careful and spare 10 minutes to care for the seedlings. Fingers crossed.
You are right. I really tell hubby that they are only happy when there are many visible fruits but they don't take the time to water at least. I said I'm going to plant seedlings again today and I want them to focus on taking care of it while I'm away.