Websites that want to push a narrative should spell out their narrative (the WTF one). This website cannot have been up for this long without having a narrative.
It's much more effective to let a reader make their own conclusion from cherry-picked data than it is to state the conclusion outright.
Yeah it's clear the authors are talking about the War on Drugs.
At the same time, if you have rudimentary economic history knowledge, then you would be aware that 1973 was the Arab Oil Embargo, and that the 1970s were an era of economic stagnation and inflation whose principal cause was that economic event.
If you reevaluate many of these graphs knowing that the 1970s were a period of high inflation, and that there was a significant economic event in 1973, you end up finding that 1971 wasn't actually all that special: indeed, most of the time, when 1971 looks to be a key inflation point, it's because the graph isn't indexed for inflation and so the beginning of high inflation being around 1971 stands out. Where the graphs are indexed for inflation, there's no obvious inflection point around 1971, instead the inflection point shifts a lot more towards 1980.
Putting that together, the only reason you have to make an argument for a monocausal economic event that happens in 1971 is if you want to emphasize the importance of the gold standard, and the only reason you'd have to believe it is if you don't have the economic literacy to understand why the evidence just isn't there at all. Put that together, and the reasonable assumption is that the people who made these charts are goldbugs who want to convince you that we need to return to the gold standard.