Fantasy vs. Science Fiction

I'll break you, but Dragons are cold-blooded creatures.

Don't they emit heat? Oh. Okay, I'm an idiot. However, a dragon won't be able to withstand ALL the rockets. (Even without thermal guidance :)))

Why is that? If that were the case, then, for example, a mirror left in the sun would heat up...

It's quite possible that the laser will reflect, BUT! It can destroy the mirror because the temperature is too high, and the mirror is a fragile thing.