If a person has a green thumbs up, they like DedSec and will be easier to recruit.
A red thumbs down means they dislike DedSec and will be more difficult to recruit.
Two red thumbs down means they hate DedSec and you won't be able to change their mind. Members of the public who hate DedSec cannot be recruited.
There are a number of way your can increase support for DedSec:
Liberating boroughs will improve the locals view of DedSec.
Help a person or one of their known associates, using information from the Deep Profiler tool.
Complete a Deep Profiler investigation.