Well, no doubt the internet drastically amplifies small rates of real failures as well as just plain rumors with firearms.
Take the Beretta 92. From what I've read, Beretta has sold over 1 million of these pistols to the US military since it was adopted.
In the beginning, there was a relative weakness in the locking block design that could cause it to fail when you ran *lots* of +P rounds through it... earlier than it might be expected to (no block design will last forever).
There were apparently some failures with the slide flying off, and at least one person was hit with a slide, maybe more. Beretta upgraded the design long ago though (maybe 20 years ago?), and as far as one can tell, it may have been a very small number of actual incident of flying slides in the first place. This is one of the most prolific handguns in history.
Yet, until this day, "experts" on the internet will tell you to avoid buying a Beretta 92 because the locking block will break and they are dangerous.