OK Krellin, I will humour you and give you my analysis. There are two main problems I have with your assertions.
One is relevance. Whether or not Obama believes that business owners do not deserve full credit for their creations (and whether or not people who prefer him to Romney are somehow obligated to believe the same) it just doesn't follow that this same belief necessitates believing that criminals are innocent of crimes. Why? Firstly, the process of creating a business and creating wealth is inherently more communistic and cooperative than the process of killing people or destroying things. The theatre shooter did not get permits from other people, take out a loan from other people, hire other people, or get advice from other people in the commission of his attack.
Secondly, the concept of justice is a far more encompassing principle than the principle of credit. I tend to believe that people should be entitled to the fruits of their labour, but I even more strongly believe that a society without justice, one without a clear demarcation of immoral acts, is one that is morally bankrupt. I think it is far worse to have a lack of justice than a lack of properly distributed credit.
The second problem I have is that I simply do not agree that Obama or the majority of Democratic supporters (I am not one by virtue of being non-American) actually believe that people deserve no credit for creating businesses. I mean come on! The democratic party is a massive supporter of a capitalistic society. In any other western society it would be considered neoconservative or somewhat libertarian on economic issues. What Obama is clearly saying here is that your success is built on the back of society, so give society writ large some credit. Given that there is a strong aversion to giving credit to lower classes in America, I think it's a laudable thing to point out, especially since "small-business owners" and "job creators" are claimed to be heroes all the damn time on American television. Your small business (or large corporation) needs institutions, infrastructure, consumers, partners, and capital to operate. ALL of these things are provided by other people, many of whom live in poverty. So maybe cut them some slack?