Steve's barking our founding fathers in no new slaves

My research has shown that just about all the important founding fathers have written extensively against slavery in their time. None of the southern important founding father with the exception of George Washington ( his slaves were freed after his death as decreed in his will) freed their slaves.
It is hard for me to believe their statements how appalled they were at slavery in this country. Those who justify certain reading of the Constitution by proclaiming this is what the founding fathers of America meant when the Constitution was written and justify their interpretation by quoting some obscure document of a particular founding father. Those who make these interpolations have some explaining to do, as too how trust worthy these interpolations are when most of our southern founding fathers wrote how appalled they were at slavery and most claimed they wanted to end it, yet still kept their slaves.