Thumb safety use = training issue.
There are no problems with other thumb safeties, given some training:
M9/92F (not only in use in LE, but also in .MIL, with a lot of personnel who don't get a lot of training).
Ruger P series
S&W 39/59/69 series
CO's in particular, are at risk of disarming. The average age of a CO is much higher than that of LEO. Their physical abilities, generally, are less. The population that both groups deal with is generally much younger and stronger, and COs are almost always outnumbered.
Again, we have a CO saved by their manual safety. It made a believer out of a lot of people.
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