You have missed the point. It is not that the government has access to your itinerary, it is that low-level government officials (apparently) have access to your itinerary with no administrative oversight whatsoever. The NSA at least puts on a show of getting FISA court approval. But DHS isn't even going through the motions.
The key passage from the article:
"The implication is that rather than search its own ATS database of copies of PNR data, the ICE investigator searched the airline’s own internal PNR database, using the DHS root access to the Sabre computerized reservation system (CRS) used by American Airlines. That was probably easier than searching ATS because the way DHS “ingests” PNR data from CRSs into ATS leaves the data less well indexed in TECS and ATS than it was (and still is — the airline sends DHS a copy, but of course retains the PNR data itself) in the CRS.
Notably, there’s nothing to indicate that the ICE investigator needed approval from a supervisor to go into Sabre, or tried some other source of PNR information (e.g. the internal ATS database of DHS copies of PNR data) first. Root access to Sabre was apparently at his fingertips, and his use of it warranted no special comment and no recording of compliance with any authorization protocols. It was a routine tool for him."
I think this even misses the broader point a little. For political opponents of particular government actions, constitutional protection against illegal searches and seizures do not exist if you travel internationally. Of course, DHS has been given extraordinary power when it comes to searches and seizure under the presumption that those powers would be used only to protect our boarders. But here they've been used to circumvent the legal framework for searches pertaining to domestic investigations, which exist largely so this sort of thing won't happen. The DHS has broken that presumed mandate, and abused its extraordinary powers not for heroic ends like the action movie cop that just wants to get the ultimate bad guy, but to harass people associated with inconvenient political groups. It's evidence that, as we might have suspected if we were more rational as a country after 9/11, that no government agency, no matter how noble its mandate, can handle the responsibility of being handed its own reigns. It's a clear indication that the full power of the constitution needs to encompass all government agencies and all of their associated actions.
I, personally, have no trust in any government, so I sort of assumed that too. But that's me. I think you're right and it raises an important question for others, whether the government is really what they think it is.
That sort of cynicism is probably the chief enabler of such corruption. As with any other human endeavor, government will never be perfect, but that isn't a reason to give up on holding government to high standards.
It is reasonable to take precautionary steps in your personal life while at the very same time demanding that the government behave such that those steps are completely unnecessary.
The key passage from the article:
"The implication is that rather than search its own ATS database of copies of PNR data, the ICE investigator searched the airline’s own internal PNR database, using the DHS root access to the Sabre computerized reservation system (CRS) used by American Airlines. That was probably easier than searching ATS because the way DHS “ingests” PNR data from CRSs into ATS leaves the data less well indexed in TECS and ATS than it was (and still is — the airline sends DHS a copy, but of course retains the PNR data itself) in the CRS.
Notably, there’s nothing to indicate that the ICE investigator needed approval from a supervisor to go into Sabre, or tried some other source of PNR information (e.g. the internal ATS database of DHS copies of PNR data) first. Root access to Sabre was apparently at his fingertips, and his use of it warranted no special comment and no recording of compliance with any authorization protocols. It was a routine tool for him."