I'm only addressing this section, curiosity only. If you were out of town on business, and your pregnant wife was found dead in the home, brutally murdered, would you never help the police by answering simple questions as to 'was it normal practice for your wife to be sure to lock all the doors at night?' 'Was it normal practice for your wife to perhaps take the trash outside after dark?" "Is there anything here in your home that you see out of place/missing?"
Let me first say, I've never been in this situation so I'm not completely sure what I would do. I believe that once I learned that I was a primary target of the investigation, I would lawyer up. I would hope there would be some way to help the investigation, with lawyer present that would prevent me from incriminating myself. But I honestly have no idea what the attorney's advise would be here. All I have to go by is what my LE family have told me in the past about not talking.
Since you were hours away, and you knew you were innocent, would you not want to help find out who the heck beat your wife's face/head to a pulp? Like wouldn't you say 'you know, there are some trailers behind our house, and I've always been a bit concerned about that.' Or perhaps, 'you know, I was outside mowing the lawn Thursday afternoon, and I saw some 'unknown' scummy looking characters walking/driving through our neighborhood.....'
Probably - but see above. It's hard to know what would go through my mind. My wife and unborn child were just murdered, my daughter was present. Cops think I did it.
What I'm trying to ask is, wouldn't you help at all in attempting to figure out WTF killed your wife??? I just don't get that? I've followed crime my entire life, even told hubby, 'ask for a lawyer', but if I knew I wasn't guilty, and somebody brutally murdered my husband, in our home, while I was out, I'd be banging on everybody's house up and down our road to see what my neighbors saw while I was gone. Much like the broken into cars.
I would have a strong desire to help investigators, but it would be very careless to do so.