If you don't agree with your vet or hvae the same beliefs, then you may want to find another, but research first [call around] and see what their protocols are before spending your money for an office call.
The previous vet I went to never advised against any vaccinations, they just gave them and really didn't speak much of them.
The current vet we goto specifically mentioned that Lepto was probably not needed, especially if Kananga was mostly an indoor dog (meaning I do not take him on hunting trips or leave him outside on his own for extended periods of time). I was glad that someone explained the vaccination thoroughly and left the choice up to me.
With that said, I passed on the Lepto and will continue to do so.