A little over a year following his debut in Amazing Spider-Man, the Punisher makes his way over to a high-profile appearance in the fourth issue of Giant-Size Spider-Man, fighting beside the wall-crawler in a 36-page story (which, excluding ads, works out to 27 pages--still a nice 9 extra pages for your extra 25¢ than what the monthly Spidey series offered). Coming along for the ride is the regular book's creative team of Gerry Conway and Ross Andru (with Mike Esposito stepping in on inks) in a story of greed vs. human lives, an equation which rarely works out in favor of the latter.
We're introduced to at least one of those lives when Spider-Man foils an attempted kidnapping of a young woman, and receives some unexpected assistance from a nearby sniper.
(I don't know about you, but there have been enough instances of Spider-Man's spider-sense being "set aside" when the story calls for someone to take him unawares that I've conditioned myself to sigh and let it slide. That said, two such instances in one scene may tax my resolve.)
As for Spider-Man's resolve to be more understanding of first responders, that lasts for all of sixty seconds, tops (in a very odd scene on Conway's part).
So what's this plot that Spider-Man has stumbled into all about? Why was this girl targeted for kidnapping? What's the extent of the Punisher's involvement (aside from having some interest in the kidnappers that may extend beyond simply picking them off)? Thanks to his journal entry, we can make a fair guess by now that the Punisher is conducting some sort of investigation--but judging by the issue's shocking (if symbolic) cover, the "enemy" that the Punisher speaks of is going to mete out some punishing of his own.