We want the right level of security for you. And always, something is better than nothing. And it being transparent as possible is best.
If you can't get to something chances are people can't hurt themselves and it keeps the honest honest. The best security. Monitoring activity can help also.
A combination of IDS/IPS, Web content filtering, and firewalls, email filters, Network partitioning, etc will go a long way towards avoiding security events both known and unknown.