Cops commit suicide at a rate of about 17 per 100,000 nationally.
And we have 4 out of how many?
At your reported rate, that would be 4 per about 24,000.
This 4 seems to come from a group of much less than 24,000.
Maybe Jan 6 trauma, plus Covid trauma, plus shutdown trauma, pushed them over the edge. Remember they are physically much closer to Joe and that bunch, so that should magnify their feelings compared to those in fly-over country.
There are about 2,000 Capital Police