The solutions that white only communities and Catholic only communities do is just make life easier with less suffering.
I'm not for or against this idea, but I am for people doing what they want to do. The other point is, the govt has been fostering race-issues for decades. In some areas of the country, people banding together might be a matter of self-defense. Violence towards 'white privilege' is increasing, due to propaganda.
Suffering effects graces. Accepting and offering up where God puts you and living the best Catholic life in those situations is what brings down graces.
Life will always have suffering; God will take care of that. Even the idea of moving and building a new community is a suffering. It's a TON of work. Because who REALLY wants to do it? People who attempt such have reached the point of no other alternative. I'm sure most of these people would rather live in a normal neighborhood. 20 years ago, when things were more normal, nobody talked about setting up such a community. Why not? Because there was no danger.
Secondly, most times, God sends suffering as a motivation to CHANGE. It's a blessing disguised as a suffering. Like when a child asks for $ and the parent says, "No, but you can earn money by doing some extra chores." That's a suffering to earn the extra $, but it's because the parent wanted to teach the child about hard work and the rewards of it.
Thirdly, we are not required to accept all sufferings as permanent and just sit there and do nothing. If we are out of milk, we don't just sit in the house and offer up our problem as a "suffering". We go to the store and buy some more.
Fourthly, suffering which CANNOT BE FIXED THROUGH EFFORTS, is that which we must accept. And most of the time, it is temporary. The suffering is mostly about patience. Eventually, God fixes that which we cannot fix.
As the old saying goes -- Work as if it all depends on you; pray as if it all depends on God.
Nothing wrong with starting a community of people you can trust. It's common sense and a response to the situation in the world today.