Noone that was under Garlean occupation has direct LOS to the bridge. Everyone living in the Enclave can see that massive Garlean tower to remind them of the occupation. The only people with a direct LOS to the bridge are the Anata and the Miqo tribe in the mountains (the Anata are/were largely indifferent to the Occupation). Ala Mhigo doesn't have LOS to the tower and Refugees camped in the Reach can't see it from there either so it's not in their face. For the Ala Mhigans, it's more of "Out of sight, out of mind" thing.