While I agree with you that such a law is poorly constructed and should be fixed, that it exists is not worrying to me at all.
Until recently, it was legal in many places to rape your wife. It is still currently legal to release pollution into the atmosphere without paying for its ecological costs. There are a lot of bad laws on the books, and even more that were on the books 50 years ago. And we're ok. We figured it out.
If thousands of people start getting put in jail for offending folks, I'll get a little more worried. And we'll fix it.
What bothers me is that you are spending energy worrying about a law that may, theoretically, be misused in the future when there are people in prison right now because of bad laws that have been on the books for a long time.
You're lucky that you are in such a comfortable position that you can worry about hypothetical future prosecutions, but I might suggest using that privilege to help people who are already in the position that concerns you.