Of course not all speed cameras are bad. However in my country there is a lot of speed cameras right before a town ends - that means that people will start slow

Of course not all speed cameras are bad. However in my country there is a lot of speed cameras right before a town ends - that means that people will start slowly speeding up from 50 km/h to 90 km/h and thus the camera will catch them going 60 km/h and give them a pointless fine. Same thing at the beginning - what is the point (except for money) in fining people who didn't brake soon/hard enough so they entered the town going 60 km/h? Why not place these cameras a little bit more inside the town?