I have a bucket of saw dust and lead mixed together in the shed for about 6 years now. I can only guess it was from a hospital x-ray room getting built. It was given to me with several other buckets with good lead in it. One of these days, I will scoop it out a little at a time and dump into a bucket of water so the lead sinks and the wood floats to reclaim the lead. And before someone on a platform tells me, yes, I do know to make sure it's water free/dry before melting. I do care.
If proper precautions are taken, I see no issue with cutting lead with a saw. Don't do it myself, probably will not ever do it. I know people that think we all are crazy for pouring lead, period. We learned to handle it right to minimize the hazard. Myself, I would not care to hear from one of them that "You just don't care". Proper precautions can be done for this method, and those that use them really do care.