Philip,
Adding my voice to the chorus.  No need to worry if the primers have a
dent in them.  I have even deprimed live primers without any
detonation, albeit, very gently.  I will also say that I have tried to
kill primers with oil, leaving it for a week or so and the primer
would still fire.

Basically, the advice you have gotten is sound.  Primers will not
detonate more than once.  It's just not in their nature.  No concern
about being called stumpy.  And for what it's worth, the bigger danger
in my opinion with an unfired primer is the risk of eye damage if you
happen to be on the wrong side of it, or of it setting off flammables
nearby.  Might burn your finger, but won't take anything major off.
Always a good idea to wear eye protection when doing anything manual.

My 2 pennies worth and it still is worth what you paid for it.......

Bruce Z
Des Moines, IA
40+ years of reloading and counting....