Gov buildings and airports = really really bad idea.
You can walk into any private establishment you want to while carrying, regardless of whether or not they have that sign. Any private place can ask anyone they want to leave for whatever reason they want to, including because you have a firearm, and if you refuse to leave then you are trespassing. It's as simple as that. Those signs are just a warning to those carrying that the owner of the place doesn't want anyone in there carrying, but if nobody knows you are doing so, how can you get in trouble for it? And if you are caught, all they can do is ask you to leave, at which point you leave or they call the cops.
Personally, I don't disarm, but this is something that needs to be thought over by each and every individual. I've carried into bars before, but refuse any alcohol when doing so. I rarely drink in the first place, so thats no big deal to me.
My gf wants to get her CCW because she doesn't feel safe at CSCC, what with the rapes that have been happening on campus and the parking garages and what not. We both know its illegal to carry there, but her safety is far more important. If CSCC campus PD and CPD can't keep the place safe, why should anyone be able to say that she isn't allowed to keep herself safe?