Many investment firms offer managed solutions where your firm can make trades on your behalf with your holdings. They tend to produce a little less upside, but they do tend to protect you well on the downside.
These questionable trades could have all been done legally with these managed solutions or stop loss triggers.
If the assets are in a blind trust, then that’s just a good trade by the trustee.
But some trusts are not as blind as the name would have you believe. Any contact between the elected official and the person actually managing the money should be nearly impossible, and in many cases that is not so.
A couple of people (the Ga senator and Inhofe) apparently had other people making the decisions for them. They should be OK.