It's awful but who sends these kids to work? What will a mother of 3 children do if she can't feed herself?
It's a terrible cycle but it takes ages to fix. No foreign company is benefitting from Bangladeshi kids making low-quality bricks for their village. What is the solution today? If you tell them they can't work, who will feed them today?
Are you personally going to donate your money to not only feed all these people, build schools and infrastructure, but also $20/hour to everyone involved in the process?