No. Metal Dragons are so GOOD so LOUD at all times that the resulting tyranny is as bad as a chromatic dragons. You stole a loaf of bread because you're starving? Still theft, you die.
silver dragon: This is NOT a "human costume", this is my PERSONA. YES, I'm going to wear it to the restaurant, what's the problem?!
I mean sure as far D&D goes. But generally speaking dragons are giant, scary, flying, firebreathing, winged monstrosities with lots of scary sharp teeth and claws.