Yes, alcoholics deserve to be loved just like anyone else. No, they are not the scum of the earth. You are correct about that.
The reason everyone keeps telling you to look out for yourself is that alcoholism is not just all-encompassing for the alcoholic, it is all-encompassing for those around him as well.
Look at your own situation. He isn't even there and you are worried and anxious. You've called his parents to bail him out of jail, you've sat in the ICU waiting room, you've had him Marchman Acted. He has now gone "missing".
Do you want that to be your life? I don't necessarily mean forever or all day every day, but do you want to be involved in that madness? Romantic relationship or friend, do you want that involvement?
These are the real choices you are facing. Now, you are also free to make that decision, just like he can make a decision to not answer his phone.
He was an alcoholic before you met him and he still is. He managed. Ask his parents if he has dropped out of sight before. If they are really concerned about him they can call the police in your area and hospitals. Why is that your job?
Truthfully, if he wants help it is all around him. He can ask for help, but he hasn't. There are trained professionals that can help him, IF he wants that help.
Just had a quick look and there are about 50 Alcoholics Anonymous meetings in Tampa today, they are free to attend.