Should any Democrats be working with Trump and Republicans on anything?

I have seen where some are voting for obviously incompetent and unqualified nominees for different positions and Departments, including national security.

Why do they feel that is necessary at this time?

Do they not see the same dangers as others see?

Or are they living in an unreal world where bi-partisanship and politics are working for the people? (The only place where bi-partisanship seems to be of any value at this time is in the Senate Intelligence Committee, in my opinion.)