The more everyone uses them, the more resistant bacteria become. It's true that these anti-bacterial gels do kill most of the bacteria on a surface, but the ones they don't kill are the ones that have a resistant to the gel. They are also the bacteria that continue to replicate. These new cultures of bacteria are now resistant to that type of antibiotic. It's a problem now that doctors have to deal with. They are constantly having to develop new antibiotics because the old ones aren't working as well any more.
Just use soap, unless there is a real need.