Leaving aside the detritus which caused the thread to be locked, I think the issues raised on the NYPD Pic thread were these, in no particular order.
1. Is there anything ominous, encouraging, or otherwise meaningful in the practice of having officers on the street in combat helmets carrying long arms? Should this practice continue? Should it become routine?
2. Given that the guy in the photo probably had a good reason for wearing a mask, when if ever should LEOs wear masks on duty. [At a minimum, I vote for "anytime they're likely to be engulfed in flame, nomex masks are OK."]
3. Is it proper for LEOs to possess or use weapons which are as a practical matter denied to citizens of the place they police?
4. On the question of continuing a given law on the books, does the burden of proof concerning its effectiveness lie with proponents of the law or with its opponents?
5. When, if ever, is it proper for a government to require magnetometer or pat-down searches for entry into a public place?