Let's not get overly dramatic here, the text portion of the news link is much calmer, likely posted later after more information was available to the press. It was not a raid, LE was requested to clean up by the family. There is no information regarding actual inventory of items recovered, live items, NFA items etc. so you don't know that the response is not completely reasonable.
We had an incident here in MI a few months back where a vet died and Police were asked to clean out his firearms etc - ended up with a significant amount of live 2.36 rockets (HE and WP), 3.5 inch rockets and grenades. The rockets were some of the nicest I've ever seen, the WP warheads were in great condition and some of the 2.36 were the very rare white band versions, with the super-sensitive fuze. All were taken away and destroyed, as were the firearms and inert items, per the family's request. Troopers explained to them that not all items were problems, but the family wanted to be rid of them.
Being indignant and angry at government over-reach is fine, but save it for when the facts are in and the situation warrants it. As a suburb of Philadelphia I'm sure that the locals have plenty of issues and place public safety first. I had contact with a PA-SP bomb tech earlier this year, turning over some live grenades from a collection not far terribly from that area. The officer was reasonable and supportive, took the three items he was given and had no problem with the 110 left behind.