I agree with your statement that the peacetime deficit of the US is/was too high - however, I disagree with you if you are infering that this means the stimulus bill shouldn't have been enacted (I'm not sure if that's what you're saying). crowding out of investment will occur, yes, and the deficit will be a drag on the economy, but I think the current situation is preferable to one without any stimulus, where the US might still be in recession or experiencing much weaker growth (and still have a decently sized deficit due to peacetime spending).
basically, by the time the recession hit there's nothing the govt could do about peacetime spending, and a stimulus bill was still the right idea (I think). I also think it wasn't timed too badly.
I do agree that the stimulus bill could have been smaller, and with less 'useless'/pork barrel spending, and been more targeted, taking into account the high peacetime deficit - it may have been worth taking time and political capital to pull this off. (I say this without knowing much about the stimulus bill/what the core components were).
I agree that future investment will be crowded out as interest rates rise. but could you explain how current investment is crowded out? is it because of the debt raising the rate of borrowing at the moment and government expenditure 'filling gaps' that could be filled by the private sector?