Whether or not anyone agrees, that's how they see it. Genrtification isn't about winning--or losing--for them its about killing a place/era they used to calll home.
Think woodstock or other "lost eras". Those times only last a short while and are fleeting. Because they are a function of the fact that they were new and unknown (at the time). Once everyone tramples into the place, whatever place it was before is gone.
Even if you still are theree: it sucks having "new neighbors" thay you just don't like. Even if you're a landowner or an established person.
See, eg https://news.ycombinator.com/item?id=7540842
(Similar story in NY)
They're the San Francisco Anarchists, well known for Black Bloc protests. They believe in a more extreme means to protesting.
http://www.telegraph.co.uk/news/picturegalleries/worldnews/8...
Rebellion, vandalism, and property damage are their tools. Anarchists have their own philosophy (arguably, its just a more extreme branch of Libertarianism).
Ultimately, they call that place their home and wish to say. Market economics however are forcing them to move. Therefore, conflict exists.
Honestly, the solution is to build more Apartment complexes and strike down the zoning laws that prevents the new buildings from going up.
(You can make maps like this at http://propertymap.sfplanning.org/)
It is strange to see Anarchists as the ones who are most rebellious against gentrification.
However, the housing market in SanFran is anything but free.