It is definitely not a positive environment. It's the first day of school, kids are excited, and then you send them home for something they probably can't understand. That can be very difficult on children, as now they are excluded from first day activities (and it's probably their first day in school ever). Furthermore, many vaccinations take multiple shots to be effective. Are you going to send them home for months? What is your plan for parents who refuses? You still have an obligation to provide an education.

You can claim it is to protect everyone else, and that may be true. However what is the actual risk here? If a kindergartener is not up to date on hepatitis should they be sent home? Pretty sure a kindergartner isn't exactly at a high risk of contracting hepatitis. Also, if there are no cases of the disease in the county (or even the country) should they be sent home? Oh I see you don't have a polio vaccine, but there hasn't been a case in the United States for over 10 years. What about diseases that pose little risk to others, such as tetanus? Tack on the fact that many send home probably were vaccinated, but the documentation wasn't in order or submitted.

Well as for the financial burden, you are missing the real cost. When the child is sent home, that means the parent can't work, and probably doesn't have childcare lined up. Not a big deal if you have a great job with paid time off, but that could be extremely stressful, especially if there is a risk of losing you job. This is why it would be a bigger issue for the poorer community, the cost of the shot is not substantive issue here.

I know everyone is well meaning, but you need to look at the potential harm and the potential for harm. Sometimes it is tough to balance the two.