If it had the same distribution as visible matter, it wouldn't be "dark". There would just more matter. It is that it is not doing the same as visible matter th

If it had the same distribution as visible matter, it wouldn't be "dark". There would just more matter. It is that it is not doing the same as visible matter that makes it useful to patch in for otherwise inconvenient observations. Dark Matter advocates, if honest, should be trying to patch up their definition to account for all these observations. Studiously ignoring them is unscrupulous.