It is really quite confusing because the people that exist in these spaces are generally quite vehemently opposed to those same types of interventions. They see themselves as existing in a system which has worked against them for years, and they are suspicious of it. They see legislation as typically working against them, and they are working to fight it.
Personally, I support the right for safe spaces to exist, and for people to be angry when they are offended.
I am also personally opposed to safe spaces. I'm queer and they made me feel like I wasn't the right type of queer. I view them as another reinforcement of utterly meaningless hierarchies.
In this case though, the author's view of the people in those spaces seems to be that they are linked with a movement that they generally reject. The author doesn't have a very nuanced view of those people. I'd venture that they don't know those spaces very well.
edit: Its also quite confusing since safe spaces have a history that starts long before 9/11.