While if the fact are as presented (a huge assumption in this day and age) he was not there to cause trouble anyone who shows up to a church were they are unknown wearing a costume is going to put the ushers on high alert.
It sadly has become a common thing for people to come to church in costume and actively disrupt the service. They even call their group "ACT UP" if I remember correctly.
1. His garb was odd, not psychotic.
2. Ushers on high alert is fine (serpents and doves and all that), they can watch for disruption and, if it occurs, act accordingly.
3. This fellow wasn’t anything remotely like a disrupter according to the account. Granted, news ain’t much these days, but all we know is what they printed in the paper.
4. Looks like they circled the wagons a little too early and, unfortunately, many others here would do the same thing.
5. I tend to take this fellows intent the way he seemed to have meant it - is Jesus welcome in our midst, or just folks that look like us and act according to our customs and comfort level?