Context: I co-run a pretty specific community in my country. We're the largest in our niche and welcome a lot of people who are new to the niche. We also made a list of counselors that are sensitive to issues specific to our niche. This list was made by our members, anyone could edit it, no one really verified the legitimacy. We've since seen our mistake and locked the list, so one of our volunteers can verify whether the people on the list, should really be on the list.

A while ago, I was contacted by a few members who had seen a specific counselor and had bad experiences with that counselor. Think: inappropriate behaviour during session, gaslighting, wanting to mingle in closed communities that clients are involved,... Stuff that is deontologically not ok, therapeutically not ok.

We removed this person from our list. Now they are applying to be on the list again, confused as to why they were removed. They are also a member of our community, stated that they used to get some clients through our list.

I don't want to put them back on without addressing the issues, but I also don't know whether it's ok to address the issues in the first place.
And even if the issues are addressed, I'm hesitant to put them back on to the list. Our community is vulnerable as it is, I don't want to expose the people in it to a counselor who behaves in such a careless way.

Can I just tell them no? And how?