One reason to give a tetanus shot is that we live in the Bay Area, an area likely to have a natural disaster. In Hurricane Katrina, there were dozens of deaths from tetanus. All preventable from a long-used, low-risk shot.
Re. skipping Polio. There was a polio outbreak in the US in 2005. Polio is currently endemic in 6 countries. The Polio virus stays alive in your system for weeks and weeks. Of all vaccines, inactivate polio is one of the most crucial.
The decision to not vaccinate is yours to make, but make sure to do thorough research. There is a lot of misleading anti-vaccine info out there. Please understand you are putting your children's and other children's lives on the line, and in some cases (like Measles and Rubella) unborn children's lives on the line. Exposing non-immune pregnant women to some vaccine preventable diseases can cause serious damage to their unborn children.
Tetanus is not as contagious as Diphtheria or Whooping cough (both of which are deadly), part of the DTaP shot. In the 1990s in the former soviet union, there were outbreaks and deaths from diphtheria. A school was closed in May in El Sobrante because of whooping caught.
A DTaP shot will giver your daughter the protection she deserves. It is so sad and unnecessary for children to die from vaccine preventable diseases in this day and age.