Do you have more information than is in the news article? So far they are talking about this being a storage yard with a lot of wooden pallets, one that already had some (unspecified) complaints against it. While that does not preclude a homeless/unhoused person being the source of the fire, it does make it a bit unlikely.
Absent more information, it seems awfully prejudicial to blame the homeless/unhoused.
I'd guess it's closer to https://www.google.com/maps/@34.025164,-118.2378776,3a,75y,8..., which is actually under the freeway, has a prominent "we buy pallets" painted on one of the freeway columns, and certainly looks like a disaster waiting to happen. It appears to be an actual business though; there's a banner advertising http://serafinsdistribution.com around the corner, which sells shipping supplies and has several photos of a lot of flammable material stored under the freeway.
lol crazy that that would be allowed at all. They should have shut that shit down under national security grounds if they couldn’t get the normal process to move fast enough