If I was Simcox, I wouldn't answer Seper's questions, either. Why would you give any consideration to someone who has proven to be little more than a bagman for the open borders lobby, and who is likely to twist whatever you say against you?
Your attempt to make Seper the focus fails to address the larger issue, which is the disposition of the funds contributed to the Minutemen. Sooner or later the truth will come out. My own guess, based purely on the behaviour of the participants, is that the money-spent-on-immigration to money-spent-on-processes-and-facilitators ratio will be difficult to see on a pie chart.