You mean besides the obvious one of the death of the target?
Then you're getting into motive. I'm just interpreting the immediate facts.
I think, though, that the hit man would know nothing of the motive. SF as a sanctuary city means lots of available criminals who get free very easily when caught. He was just told to go to the bench and get the t-shirt wrapped gun (or that's a lie and he just carried it there all wrapped up himself), shoot her, dump it in the bay, and walk away. The stupider his story, the dumber he acts, the less they can trip him up with a complicated story and the more it plays into the media's "poor Mexican" crap.
As for the actual motive, who knows. Obviously, the fact that the murder hit the national news might not be accidental. Yes, fit all the Pollyannas out there, people have indeed been killed in the past to use as political issues. Or the woman got herself involved in something bad, with bad people, and they got rid of her for whatever reason - she threatened them, tried to get out, talked, whatever. Or both reasons, or more. Who knows.
But a squeaky-clean angelic woman fresh from heaven itself accidentally shot by a moron criminal illegal Mexican out on a lonely pier when a found-gun accidentally fired itself three times only at her? No.Way.
Actually,
“But a squeaky-clean angelic woman fresh from heaven itself shot by a moron criminal illegal Mexican Yes. Way.”
Evidence she was anything other than what we see is non-existant.
Evidence the moron criminal illegal alien that is capable of a complex scenario (even as a patsy) is non-existant.
I wonder if the gal who was killed resembled the sheriff’s wife or girlfriend.