Judging by the imbeciles that had the nerve to deface something they don't have the first clue about, I'm going to go out on a limb and say that clarity & logic aren't exactly strong traits they exhibit.
The idiocy of acts like these on all historical monuments and markers really are an affront, and infuriate me. I can only hope this foolishness ends soon, once and for all.
Being placed on the national register opens up a lot of doors for other sources of funding in the form of grants, etc., but it doesn't actually bring any direct financial aid.