Dems tend to be liberal. Liberals tend to empathize. The tend to understand human behavior on a deeper level than most conservatives, who tend to gravitate toward spreadsheets and demonizing poor people.
If you think about it, though, you will find no human beings who don’t “want.” We all want. The Koch Brothers want to amass more wealth by destroying the planet, deregulating the energy business, and ending social security. Meanwhile, Martha would just love to have that painting she saw at the thrift store, but it costs $22, so she’ll have to wait. Simply “surviving” is rarely good enough for most.