Hi there! Here's my personal opinion:
I personally enjoy a lot this long asses JBs that never ends as there's a lot of fun and action and it makes both sides (cops and crims) very active. Tell me: how many players you see online when it's happening and actively taking part in JBs? It brings activity! I could literally spend hours there (I usually do)! Both sides likes and enjoys it I think, cops and crims. Crims enjoy attacking and killing cops at JBs (only for fun as they don't win any money with this) and cops enjoy too attacking and killing crims as they get kill-arrested and back to the cells in order to stop the JB (where they belong imo) and they win money with it. They fight for the jail's control until 1 side wins the other side or just 1 side gives up (if cops for example gives up going to the JBs then it'll end as crims will get bored... no cops, no fun). And same goes for the cops... no crims, no fun. Am I right?
As I enjoy this a lot (and I know that a lot of more players does), I wouldn't like to see the current kill-arresting system changed as it'll ruin it and that's why I've voted for the option of keeping the current system (it'll ruin 1 of the best activity to do in-game which is JBing). It'll ruin it because the JBs will stand for much lower time, they'll end faster... 2 cops comes, shoots 2 times and JB will be over. There won't be so much fun and action as there's now. Yes, yes... there'll still be fun and action (I'm not saying there won't be anymore) but not that much as now and you know that.
"But if criminals get killed and they spawn at the hospital, it's an easy escape." - by @Vennelle . I also agree with this. As a cop, I wouldn't like to see crims and prisioners escaping from jail that easy... a simple kill and they're out! Wtf! It's better to get their asses jailed back to their cells where they belong to! Yeah, it used to be like this back in times until kill-arresting got added. Honestly, at the start and before it got added I used to be against adding it but it made the both sides (cops and crims) more balanced and equal. I've experienced it both (as the crim I'm and as a cop sometimes when I play as cop) and I see nothing wrong with it.