You sorta answered your own question. You live in Mass., it has certain political leanings, and there are tons of interest groups there who would like nothing more than to see the herp trade shut down. It's hard to get things banned outright, so they just regulate the heck out of them.
In some places some herps could be banned because of worries that they would be released and crowd out local populations. However, I do not think this is the case in Massachusetts with chameleons. This is just a punitive regulation enacted to satisfy interest groups.