What will happened to those who use the mixer previously. Is there a chance that my Bitcoin will be connected by Bitcoin use from money laundering or we are still safe? I use Chipmixer every week to mix my coins. Its sad to read this bad news. 
Agreed. This is very much similar to how the government has arrested Tornado Cash's developer for creating a tool to protect someone's anonymity and privacy. I reckon if a car was used by a criminal to kidnap someone, the government cannot arrest the car company or if a cellphone was used as detonator for a car bomb that killed hundreds of people, the government cannot arrest the cellphone company.
And yet, in the case of Tornado Cash, hundreds of millions worth of different coins linked to the mixer in one way or another were frozen. This was generally a blanket move. This wasn't just done selectively to suspicious wallets and addresses. This included funds of innocent and unsuspecting Tornado Cash users.
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Does this imply that there are government agents who are reading our posts and following some accounts who might be a danger to society hehehee?Of course, most likely. They've probably long been here. They're probably not just reading; they might also have accounts. After all, this forum was also the place where Silk Road's Ross Ulbricht, altoid here, left a trace that cost him his freedom.
This forum has probably been an interesting place for them.