You're being downvoted because issuing a cert for MITM on an "undermined CA" is, in many cases, a very quick way to get that CA burned. If you have a compromise

You're being downvoted because issuing a cert for MITM on an "undermined CA" is, in many cases, a very quick way to get that CA burned. If you have a compromised resource that valuable, you're going to use it very very sparingly.