My dad can affirm that you can feed a suitably substantial piece of stock
the correct direction through a joiner, using the proper pusher, and taking
only the merest fraction of wood off, and still turn the tips of your
fingers into a fine red mist when the stock decides to jump. There is no
safe combination of joiner drum and human finger. The only way to avoid
serious injury on a joiner is to keep your fingers as far away (and
preferably downstream of the feed direction) as possible from the drum.