Fundamentally and obviously Right.
Note the Capitalization of Good Thing.
The concept of a Good Thing is something which is "fundamentally and obviously Right":
- Returning a lost wallet is a Good Thing.
- Helping an old lady across the street is a Good Thing.
Being polite to strangers is a Good Thing.
Often, "Good Thing" refers to a strong or common opinion on something more than to a there being no logical "Good" alternative:
- Spell-Checking is a Good Thing.
- Vegetarianism and veganism are Good Things.
Banning leeches is a Good Thing.
Also, at times a "Good Thing" may be a Dangerous topic:
- Joining the military to fight for your country is a Good Thing.
- Fighting terrorism is a Good Thing.
Denying such service because of personal beliefs is a Good Thing.