For what it's worth, I do not think anyone was attempting to attack you, rather trying to figure out what you may be seeing that others are not.
Since there is no way to easily identify the bad folks, there's really no other choice. The guy in Vegas was a frequent guest of the hotel and to this day nobody seems to know his motivation. There have been school shootings, workplace shootings, public bombings...few of which could have been stopped with mere profiling. (And the ACLU typically has a field day with profiling.)
Room damage could be determined after guests leave...though I've yet to hear any actual stories of people being charged-back for damage. To hotels, everything but the most blatantly destructive acts are considered the cost of doing business. Purchases can be more effectively tracked a dozen other ways: MagicBands, ADRs, room chargebacks, credit card records, etc.
Disney has better things to do than send clipboard-toting Cast Members to 30,000 rooms, nosing around for personal info. I guarantee you these people aren't going to be poking through suitcases or noting what brand of deodorant you use.
If you have concerns, make arrangements for them to come while you are in the room. Disney has already said they'll accommodate that. But it appears Hilton hotels are adopting similar policies, some in Vegas already have including Wynn and MGM Grand properties. I'll be shocked of most hotel chains don't soon have internal policies dictating that they visit every room on a daily basis. In most cases, it will just be usual daily housekeeping visits. And that's exactly what this is shrouded as--a daily room visit to empty trash.
Throughout the hospitality industry, I suspect the practice of hanging the DND tag and not being bothered for days is quickly ending.
I realize some people are willing to trade personal security for privacy. But hotels and other businesses cannot always afford to respect those wishes. Criminals are the first ones who would raise their hands to opt out. Don't expect MY family to remain at risk because the guy one floor above us wants to do lord-knows-what while holed up privately in his room for a week.