ok some of the things on your 'list' sound more like reasons why you COULD be a good adopter, rather than why you WANT to be one.
I'd say…
-wanting to be a parent
-wanting to enlarge your family/have another child
And these 'wants' can't really be legitimised nor do they need to be. They are either there or they aren't. The same with wanting children through giving birth, really.
IF you have more than one option as to HOW to become a parent/have another child, the next question is, why adoption rather than anything else. And here it is a weighing up of the pros and cons of each option. I'd say in many ways adoption is amongst the hardest ways of achieving those 'wants', so, if indeed you have a choice, it is worth thinking about why adoption.
In our case it is a combination of:
- not seeing genetic ties as more important than lived relations, making giving birth and adopting equal in that sense
- a view that we don't want to 'make' yet another human to burden our overpopulated planet, a clear + for adoption
- a feeling that we could make a very meaningful difference to a child's life, yes it is a bit like the saviour syndrome, but as we see it, we would like another child and there are children who absolutely need to find a family, so it just plain makes sense, no?
The next question to ask is then, why do we think we are able/capable of achieving our idea of a happy family, through adoption.