This is a tough issue for a government. We do have crazies out there and we do need to investigate potential dangerous groups and individuals and reel them in before they do something crazy. On my FB feed I have seen friends and friends of friends call for armed revolt many times over the past few years. Most all of them are blowing steam and many are in their 60s or older and couldn't run a block in gym shorts, and…
They were monitored. To the extent that the lead of the Proud Boys was actually supplying intel to the feds and the Status Coup youtube channel (which I think was taken off line for some Kafkaesque reason) was recording various pro-Trump people in public calling for such actions.
More monitoring is not needed. Monitoring did nothing to stop the 9-11 Saudi allies from carrying out their mission. The only thing monitoring does is to make people fear to express their thoughts online in case they get into trouble.