The high cost of 'averaging down' without a thesis

I've been thinking a lot recently about a mistake that cost me a good chunk of capital a few years back, and it was a classic case of averaging down without a proper re-evaluation of the original thesis. I had a position in a mid-cap tech stock, let's call it $ACME, that I initially bought based on a strong earnings report and what I thought was a solid growth trajectory in a niche market. My entry was good, and for a while, it did what I expected.

Then came a sector-wide correction, and $ACME, being a smaller player, got hit harder than its larger peers. Instead of objectively reassessing whether the fundamental reason I bought it had changed, or if the market structure had broken down beyond a simple correction, I just saw the lower price as a 'bargain.' I started adding to my position, telling myself it was just an opportunity to get more shares cheaply. I averaged down several times, convincing myself it was a smart move, right up until their next earnings report completely missed estimates and guidance was slashed. That's when I finally had to swallow a significant loss, much larger than my initial planned stop-loss would have allowed. The lesson was clear: don't just average down because the price is lower. Revalidate your initial reasoning, or accept that the trade is dead and move on.