I am not sure where you are sourcing your data, but I was unable to find any conclusive results on the dangers of laser cutting aramid fibers before I attempted this.
I looked into cutting both kevlar and nomex, and they are both regularly cut with CO2 lasers in industrial settings. The fumes are not noted as being particularly dangerous in ANY of the MSDS documents I read.
To quote the Dupont MSDS for Nomex aramid…
Burning NOMEX® and KEVLAR® produce hazardous gases similar to those from wool.
These are mostly carbon monoxide, carbon dioxide, nitrogen oxides and small amounts of hydrogen cyanide, ammonia, aldehydes, aliphatic hydrocarbons and other toxic gases depending on conditions of burning.
http://hazard.com/msds/mf/dupont/nomex.html
I found some documentation of a potential inhalation risk from the short fibers produced, but I am personally comfortable given the amount of ventilation the Glowforge provides.
http://www.airsystems-inc.com/air-purification-news/air-quality/laser-cuttings-harmful-side-effects/
Note that the source for that link is a company that MANUFACTURES air cleaners/filters.
You are welcome to choose your own level of concern, but you should really do some research and avoid scaring people unnecessarily.