Almost every blow up starts from not using stops or not adhering to stops for whatever reason.
This is followed by confidence in the position, and adding to a position in a loss. If traders NEVER did this, I would say 80% of them would not blow up. This does not mean they would not lose, but this alone accounts for the majority of the problem.
I will give you a story of my blowup.
I started trading full time in 1996. The prop shop I opened with had many good traders in the office. I started with about 25k in my account, which was leveraged up to 200k intra-day if I needed it.
I started out trading the right way, and built the account up to about 35k in about 2 weeks time, trading 300 or 500 share lots only.
At this point, my confidence was growing. I then asked around, and asked what the office record was for a single day of day trading, starting the day with no positions and having an account size of less than 50k. I was told the record was 11k, without being stupid (meaning going all in on a low priced stock etc).
I told them I would beat that record the next day.
I traded like crazy, and at the end of the day, I had amassed about a 12k profit. I was very proud of myself for doing that.
That was also the "peak" of that trading account.
I tried to come in the next day and do the same thing, but the markets would not have it. I ended up losing about $4500 that day.
The next day, I vowed to make it back, and lost another $2500.
You can see where this is headed. In addition to losses, I was racking up massive commissions from over trading the account. Instead of letting the markets show me how aggressive I should be, I was trying to "force" the markets to give me winning trades.
Basically 3 months later my account was near 0 and I was done. My early success had doomed me, because I had a severe case of overconfidence. Even though I knew how to pick the good trades, in real time I was somehow "avoiding" the winners and only playing the losers.
Years later I realized what had happened to me. Because I started losing, my brain wanted to avoid losing at all costs. So subconsciously I was filtering trades that "looked safe", and avoided ones that did not. All I ended up doing was playing stocks that did not move that much, or were near a support(long) or resistance(short) which eventually broke etc. I would cut winners early, because I did not want them to turn into losers.
I learned a lot from that experience, and have not repeated it since.