Tech companies have approximately zero to do with the mess SF is. Tech has only become significant in SF in the past decade or so. The major tech area is south of San Mateo--Union City, commonly known as Silicon Valley. OTOH, bums crapping, urinating, and leaving used needles on streets and sidewalks goes back 20-30 years.
Birrell displays his ignorance of the SF Bay area and is whipping a bogeyman to distract from the fact that the problem is due to decades of governance that subsidizes, enables, and protects the homeless deathstyle.