And how many “accidents” have occurred on russian spacecraft using pencils?
Lead pencils were discontinued on Soviet (and hence Russian) spaceflights since 1968.
The Parker Zero-G pen was developed after the Apollo 1 fire in 1967 that killed 3 astronauts. That fire was caused by a number of factors, primarily being a 100% oxygen atmosphere combined with overuse of the "friendly, inexpensive, useful" - and flammable - fabric known as "Velcro".
After this, fire hazards of even the most "innocuous" items are taken VERY seriously by spacefaring organizations.