Revenge of the nerds and Itchy trigger fingers I guess. I got rid of an S&P500 ETF that admittedly I got into a little late on Thursday at noon but hung on to everything else most of which was bought in late March. Like you've been saying this really isn't unexpected but everyone who didn't ditch in the last couple of weeks needs to watch the top of the tower for falling bricks next couple of weeks.
September is typically the slowest month of the year in almost any industry and it is historically reflected in stocks not to mention election years historically have a drag on Wall Street. I'll ditch if I have too but it's hard to let go of ETF's that that you are $100 plus a share up on...a lot of room for resettling there before throwing the baby out with the bath water.
Pro tip (that was very, very, hard to actually do personally): if your greatest regret in trading life is, "I wish I wouldn't have sold so soon," you've likely made plenty, and, more importantly, kept everything, you started with. I could care less if we gap up 2.5% on Tuesday morning open and I "miss" out on that gain, I "missed" out on the 6% (or whatever it was) fall this past weak. And given that I only use leveraged ETFs (in either direction), those %'s would be magnified at least 2x (if not 3x).
We are in a band of support right now with the SP500... right smack in the middle of the band. The center of the band is 3412 and we are at 3415. Now, I think it is more likely that support holds and we break upward and push even as high as 3612, but when in the band, you wait for confirmation on which direction we are going. Given the world today, and given last week and where the market is sitting right now, no way in hell I wanted to leave stuff hanging out there going into a 3 day weekend in what you correctly point out is a slow time of year trading wise... volume is THIN which means the market can get pushed one way or the other VERY easily.
And no, I'm no "genius" let alone an "arrogant **** genius" when it comes to trading. I spent plenty of years losing money because I was an arrogant **** who thought he was smart enough to be tricky instead of following some very basic rules/systems just trading the major indexes and sectors/commodities with leveraged ETFs... and learning when to just sit the fcuk out and wait (which is the HARDEST of all to do).