I would like to say "let natural selection take its course," but idiots such as the quartet you observed can cause harm to others, as well as themselves, and they damage the cause of lawful vehicular bicycling, "same rights, same rules, same roads," etc. I wonder whether these yo-yos even had brakes on their bikes.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069