There is some cause for concern however much depends upon your location. I have many friends who live in Newton and are very happy there. This website will give you statistics on crime in Newton (or any other town) and a lot more: http://www.randolph-chester-homes.com/micommunity/zip/07860/
I work in ths area and would be happy to consult with you on the purchase of your home. Feel free to contact me to schedule a free consultation.
973 207 9803