When alligators receive food from people, it makes them bolder as far as approaching people.
They will start to associate food with people and will expect it to be given to them by other people.
Alligators are wild animals and they could attack you in some situations.
It is not good for the alligators and it is dangerous for people who feed them.
Keep in mind too, that if you clean the fish you caught, and throw the scraps into the water, you are in essence feeding the alligators.