Getting a dog is a big commitment. Whilst emotionally you are adding a family member in reality you are bringing an animal into the home - an animal that needs to be taught it's place in the pecking order and what is and isn't allowed.
This might sound a bit draconian but remember that dogs tend to be pack animals. In that pack they take a lot of comfort in knowing their place in the hierarchy. In terms of home dog training that means showing them that you are boss - and what is expected of them.
Home Dog Training
Home dog training can take a lot of effort. Consider how much training you need to do:
Toilet training them
Teaching them not to jump on furniture
Training them not to go for food you have prepared
Stopping them escaping
Stopping them barking at anyone that walks past
Stopping them attacking visitors
And much more besides.
Because dogs like to know their place it is important that you teach them it, and teach them what that place entails.
Your Feelings
For many people home dog training can be hard emotionally. Many people aren't well suited to bossing around a dog, making sure it knows they are master. What is important to remember is that dogs like this sort of treatment.
In the wild dog packs have a strict hierarchy. Every dog knows where it stands and what it can and can't get away with. This is because the dogs naturally like this sort of behaviour - and so it is in your home.
By providing them with rules, training and a 'place in the pack', aka your family, they feel included, part of the family. So whilst it might be you think that training a dog is unfair, get over it - you are doing them a favour!