I am a CERT instructor & team member, 20-year EMT, SAR tech, rope rescue tech, and firefighter.
I am fully against untrained people going in to collapsed structures. This is simply a way to add a +1 to the initial kill counts. Similarly, even with proper training, if you don't have proper equipment, same thing. Similarly, even with proper training and equipment, are you by yourself? If so, same thing. Call 911 or call in the location on ham radio (if you have one), but don't go in to a severely compromised structure.
What consists of "compromised"? The CERT Training explains it.
One thing about CERT training - Go to in-person classes, if available in your area. The online class is nice, and goes over all the book-learning part of it, but nothing will replace first-hand knowledge of how hot fire is, or what a water cutoff valve feels like when you're turning it, or how shaky cribbing feels when you're lifting a wall with a lever. Do it in person, and you'll gain a whole different perspective.
I'd also recommend Hazardous Materials Awareness, and FEMA's IS100 and IS700 self-study courses.