The GOP opposed all 3 of those programs from the get-go, and continue to do so up to today. Reagan made an impassioned speech against Medicare, saying it would take America down the road to socialism. Numerous Repub politicians have attempted to cut those programs, which they falsely describe as "entitlements". Paul Ryan tried to convert Medicare into a voucher program, a move that economists said would require people to pay over 60% of their medical bills.
Estate taxes should be raised. We routinely pay taxes whenever money is transferred from one person or business to another. Thus we pay taxes on wages and sales and capital gains. We should also tax the transfer of huge estates to people who did little to nothing to create that wealth. We have protections in place for the transfer of family farms and small estates. We should not have policies in place that cement and help develop elite family dynasties.
It is reasonable to debate what constitutes infrastructure. Biden thinks that human capital matters as much as structures like bridges, roads and airports, and I think he is right. In particular education is the key to success for any and all nations going forward, and so an increased investment in our schools is warranted, as is investment in childcare programs to enrich the lives of our kids and to allow their parents to work. I am not surprised to find that conservatives object to spending on education or childcare. The Chinese have no such qualms and plan to leave us in the dust as the 21st century economy is going to be knowledge- and technology-based. American companies are already complaining that they cannot find enough educated, skilled workers, and why can't we fix that going forward?e