Ten-year-olds Natalie Okri and Hollie Steel and 11-year-old Aidan Davis were all visibly upset at moments during the programme, attracting criticism from celebrities and members of the public.
However, Morgan told the Daily Mail: "I thought that was a ridiculous argument with the kids.
"I've got three kids and they have all been in school productions, and other kids cry or refuse to come out. They get nervous, but, you know, kids cry."
Morgan previously expressed his sympathies when Okri was reduced to tears after missing out on a place in the final of the programme.