First,
@SachAccess, thank you for your kind assessment of my (sometimes not so humble and often quite rambling) ideas.
Second, I do not write regularly on other forums since too many of them often become SPAM-fests or shouting matches. Also, I tend to be somewhat protective in my personal space, so I rarely let people in very far. It is my personal preference that I want to keep a limited public profile. There is the added issue that a lot of my writing time is spent in writing fantasy fiction. No publications yet, but a couple of nice rejection letters! And I spend some time on home programming projects, most recently including a genealogy support program that is capable of reading a rather complex file format called GEDCOM. I used it and continue to use it to build family tree information and documentation. Considering that I now have a family tree that, with sibling branches has reached over 2200 members, I've been busy. So my time for writing is sometimes limited. But some day, that family tree data will be for my grandsons.
Finally, regarding morality: To answer that question, we have to look at anthropology and its study of the development of Mankind, not from a pure historical viewpoint but also from a social viewpoint. Then temper that with a little bit of evolution.
Man developed in such a way as to become a somewhat gregarious animal, one who learned to tolerate and even thrive around his herd/pack/close neighbors. But man also has a territorial streak inherited from our saurian ancestry. So we developed a protective attitude against strangers/people who were different. We tended to shun folks unless they adopted our ways.
If you allow yourself to think about it objectively, you can see that the Ten Commandments can mostly be derived from people making rules so that everyone in an extended community - defined as "too big for everyone to personally know everyone else" - could just get along with each other. A couple of those commandments are primarily so that you can get along with the priest/shaman/fakir. I.e. since the commandments came from a religiously oriented source, a couple of extras got tossed in to placate the religiously oriented source. Otherwise, we might have been talking about "Eight Commandments."
Proponents of "divine" morality claim that the commandments came to us from God. Proponents of "practical" morality point out that if you stayed within the limits of the commandments, you were less likely to be banished from the community or bashed in the skull by a jealous neighbor. For whatever reason, communities taught behavioral standards based on those implied or explicit rules.
Let's dip into Christianity for just a brief moment. Jesus is quoted as saying (and here, I'm paraphrasing) that the commandments could be derived logically from two simple ideas: Believe in God, and Treat Others As You Wish To Be Treated. But if you realize that the "Golden Rule" appears in multiple religions for a long time before Jesus or even before Moses, this leads to the question of its origin. And in anthropology we find that the origin is blindingly simple: Treat people kindly or they will kick your butt out into the wilderness where you will have NO help when you need it. It is a basic survival rule.
Therefore, back to your morality question. Something is immoral if it is likely to get you ejected from the community. Being put in jail counts as 'ejected from the community' for this discussion.
The fact that so many people get away with immoral behavior is because of a limited number of reasons.
(a) Legal loopholes due to complex laws or laws introduced by too many folks who are soft on crime for some reason
(b) A violent gang has their back - or a misguided gang has their back... see "(a)" and "soft on crime"
(c) the action was against someone else who ALSO performed questionable actions, thus leading to an ambiguity.
I'm sure there are other reasons, but it always boils back down to the Golden Rule which is common to, but precedes, all major religions. When your action will intentionally and needlessly hurt someone else, it is probably to some degree immoral.