Other than the time they were looking for the son and he was at the protest, the characters don’t have the presence of mind to turn on a TV, radio, smart phone, or computer to try to find out what is happening. In a real zombie apocalypse all social media would be melting down with millions of posts.
I understand what you are saying..........
I don't know how long you have been a fan of TWD but way back in the beginning it was explained by the writers that "Zombies" were never a part of the vernacular and thus the survivors never knew how to deal with them other than from experience.........
So the same philosophy applies here, lots of dying creepy people and the authorities trying to keep this mysterious disease under control...........
And to be realistic, without realizing the consequences of this virus that is spreading like wild fire, you just don't go around shooting people in the head who look "sick"...even tho you and I in the viewing audience know they are going to be zombies.
They were on cell phones, etc. The “Media” isn’t/wasn’t showing what’s really happening. Sorta like real life.