You're dead right. This is all part of the game that we're involved in. Most buy & hold investors get too emotionally attached to the stocks they invested in and they get frustrated if they see any signs of manipulation.
If you look back at the price chart of the past five years, I am sure there were many such days where someone sold a big quantity at the end of the day, but in a long-term chart you won't even be able to spot the effects of such sell orders.
Bottom line is that the longer term chart looks good which is why I added a significant amount of shares earlier this month. I never worry about intraday charts, because I've got too many junior miners to follow every day. The only thing I look at is cycles from top to bottom and back. I try to use those cycles to my advantage and I never get emotionally attached to my stocks (although CMM may be a bit of an exception :-))