If the CL is a good fax writer we can help them have a great RP experience that round. There's many things a CL could get done that don't involve round-disruptive stuff.
I would say I agree with your first point, but considering that a good whitelist application takes a disproportionately large amount of effort to make, and that there is near-zero tolerance for screwups, it just doesn't make sense. Few roles are as effectively able to grief as, say, a PFC with a grenadier kit.
As for the second point, how can we simultaneously not monitor what the CL is doing and then spawn an ERT or abomb the xenos or whatever just because the CL majorly disrupted the round?