I am a law school graduate currently awaiting Bar results. What I offer is free information, not to be construed as forming an attorney-client relationship.
Reckless endangerment is what it says: he recklessly (without thinking, or completely and voluntarily ignoring the situation) endangered another person's life.
Now, if he has a court appointed atty and that atty is too busy to see him, your husband has the right to change attys if he feels he is not getting adequate representation. But keep in mind, this type of behavior by the court appointed lawyer is normal, not excusable but normal. You may be able to get a legal aid attorney to help you for no cost or refer you to someone who can for no cost or very little. You may be able to via your new atty get the court to take money out from the public fund to pay for his/her services.
I suggest you look up the local legal aid foundation in your yellow pages (community guide section under legal aid).
Hope this helps.