As for the girls, I think that the clothes might be as modest as you can get while playing the sport.
"As modest as you can get"? Does such a standard exist in the public forum? I don't see how.
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As far as girls' sports, if they are in a closed venue with a known girls sport taking place,
Such a "closed venue" does not exist in our current society. You're inserting an idealism which is imaginary.
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then if some guy shows up there and finds himself "tempted," then he should have known better than to go there.
If he were tempted for reasons other than the clothing, I agree. But since we're talking about clothing, your point makes no sense.
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But it looks like they are outside of the sports venue, and the picture should not have been taken that way. They could have had them stand up and capture only the view above the bottoms of their uniforms.
They were either dressed immodestly or they were not. These girls either scandalized those in attendance or not. The issue of the picture is a SEPARATE issue, where they take an isolated immodesty and SPREAD IT to those not in attendance. Assuming one argues that the clothing was immodest at the game, then a picture is an ADDITIONAL sin, which exposes the scandal to far more people.
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So, for instance, if there's a private property, a camp, for instance, where it's just girls in attendance, they could go swimming. So what might be OK in that context, may not be outside of it. Same thing applies to some girls' sports.
We don't live in this ideal world where women are separated from men in sporting events. Your example of swimming at a girls camp is acceptable. Sporting events aren't private in the same degree. Not. at. all.
In a Catholic society, girls' sporting events should likely be offlimits to men and boys ... except as necessary.
That society doesn't exist. We're talking about current reality.
But, as it is, if they restrict their immodesty to within the venue, nobody is forcing any man to attend. If I walk into a womens' locker room and see nude women, is that their fault and are they being "immodest"? I should not have gone in there ... obviously. Likewise, if there's a girls' swim meet, I should not go in there, nor a girls' volleyball game.
No such thing as a girls-only swim meet. They don't exist nowadays.
So, the rules, IMO, should be:
1) dress as modestly as possible given the sport if someone is playing (coach and other staff do not count)
2) keep the objectively-immodest dress within the venue (don't venture outside of the venue or take pictures that aren't properly cropped)
You are either dressed modestly or not. "Modestly as possible" is anti-Catholic thinking, and only applies to emergency situations.
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Pope Pius XI on sports, to women:The means employed to give health to the body, “the noble instrument of the soul,” he stated, should take into account suitability of time and place.
They should not excite vanity or promote immodesty. And they must not lessen a young woman’s “reserve and self-possession
which are both the ornament and guarantee of virtue”
– Pope Pius XI – (Letter
A Lei, Vicario Nostro, May 2, 1928).
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Pope Pius XII speaking to girls on sports:“If a form of dress becomes a grave and proximate danger for the soul, it is certainly not hygienic for the spirit, and you must reject it” . . . . “Will you, then, for the love of Christ, in the esteem for virtue, not find at the bottom of your hearts the courage and strength to sacrifice a little well-being – a physical advantage, if you will – to conserve safe and pure the life of your souls?”- Allocution to the girls of Catholic Action, October 6, 1940.Papal Decree Concerning Modesty,
POPE PIUS XI, 12 January 1930http://www.olvrc.com/reference/docuмents/Modesty.Pius.XI.pdf3. Let those same
parents prohibit their children from public athletic events and gymnastics competitions, or at least, if their daughters must be involved in them, that they take care to exhibit clothing which is
fully in keeping with modesty and that their parents never permit them to wear immodest clothing.
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"Fully keeping with modesty" does not mean "modestly as possible".