As
Wikipedia notes, the Santa Monica Freeway (the 10 between downtown and the Pacific) is one of the busiest freeways in the world. It is the
only east-west freeway serving the millions of people who live between downtown and Santa Monica, including the entire Westside, more than half of South Los Angeles, and numerous adjoining cities. Los Angeles would cease to function if the 10 were summarily ripped out and replaced with just another east-west boulevard like Wilshire, Santa Monica, Olympic, Pico, Venice, etc.
The regional public transit agency has invested and continues to invest significantly in alternatives to driving generally, and on the Westside specifically. A
light rail line from downtown to Santa Monica opened in 2012, spurring construction of thousands of new homes and offices. And Metro is currently extending a heavy rail
subway line that currently runs from downtown to Koreatown westward through Beverly Hills, Century City, and Westwood into Brentwood. There are many other regional bus and rail projects planned or under construction that are due to open before 2028, and one of those is a light rail line, south of the 10, that is set to open this year. This is all necessary and good--there is no doubt that we need more and better public transit.
However, freeway removal only makes sense on lightly-used, redundant routes--and the Santa Monica Freeway is neither. Arguing for its removal in a metropolitan area with over six million cars in the year 2022 is either willful ignorance or just tilting at windmills.