When one realizes that he or she is going to lose something when he or she misbehaves, it helps the person to be more serious and this is just what the introduction of slashing as a way of punishing the validators tends to achieve.

It helps to build sense of belonging even though in most cases, the offenses are not entirely intentional. You have given a wonderful explanation of what slashing is, breathing life into it.

I also agree with you that steem doesn't make use of slashing but delegated proof of stake. But if applied, i believe it can further help.

Thank you for your explanations. Success to you