“you don’t think that whatever a Bais Din does has any validity”
I guess you think that any time 3 Rabbis who call themselves dayanim say anything to anyone everybody is required to listen.
In order for a B”D to have any authority AL PI HALACHA (forget secular laws) The parties have to both willingly agree to submit to the B”D. The B”D will even make the parties do a Kinyan to pass the authority to them. Without this even Al Pi Halacha the B”D has NO authority whatsoever.