Our country was formed with the understanding that compromise is a necessary component of our representative democracy. You have one side of the aisle (the right), that has adopted the stance that they will never compromise on anything - the minority party believes they can dictate their viewpoints on the rest of the country.
Not to mention that none of those things are even in the Democrat platform, with the possible exception of some level of gun regulation (I am not sure what that might be), but I think that there is enough bipartisan 2nd amendment support that this is a minor risk.
Medicare for all is not what the Dems want, they are going to put forward a public option, which should have been part of the ACA from the beginning.
Nobody wants open borders - illegal immigration is a red herring issue, anyways. A wall is not needed - Trump could have eliminated all illegal immigration by going after companies and individuals that hire undocumented workers. No jobs and they go home.
Climate Change - CA has led the way with solar power adoption and EV cars to show that a post-gasoline world is possible. In the past 20 years, solar power efficiency has grown exponentially. Solar panels now reach parity in less than 5 years. Waiting until fossil fuels become so scarce that it becomes dire makes no sense. There is no down side to having more diversity in energy generation.
