Protecting our loved ones is something we all want to do. It's an instict. We want to protect BTS in similar manner.
But don't let that love turn into something toxic and authoritarian. Because that isn't love anymore. That's desire to control. Trying to control who they talk to,

Collab with, their artistic expression, their artistic vision. That's not something a fan should be doing.

You must be thinking 'i know what's best for them', no you don't. That's not a fans place to say.
Concerns if any should be forwarded in professional manner.

There's a section of fans that want to 'MANAGE' bts under the claim that "we want the best for them or to protect them".
There's a difference between support, protection and restrictions. Please know that.

Worse are those who start harassing people collabing with BTS because of their own personal bias against that person.

You (who's doing it), you're harming BTS's professional ties. Your behaviour is going to reflect back on BTS. BTS hearing "your fans are crazy" is disheartening.