We do not need our bodies once we leave this world regardless of what you think happens after we die. We should be focused on curing diseases and extending the life of living humans. Science would go so far if we used human bodies after death instead of requiring people to give consent to something they don’t need.
Again, there are big differences. It’s going from minor corruption to full on why does anything matter talk. Why vote when elections don’t matter? Why get a home when they can just take it away? The only thing keeping us human is consent. Again, that’s all that matters. That’s all that rights are.