Final answer:
The text provided does not detail interactions between beachgoers, policemen, and aliens but instead depicts the struggle of shipwrecked individuals against the indifference of nature and the efforts of the shore's inhabitants to assist them.
Step-by-step explanation:
The reactions of the beachgoers and policemen to the aliens are not explicitly described in the text. The provided passages present a scene where people on a beach respond to a human crisis at sea, as opposed to an extraterrestrial encounter. The text touches on themes of humanity's indifference to individual suffering and the struggles of survival, as shown by the beachgoers providing help to the shipwrecked with blankets and remedies, and the intense battle against nature faced by the men at sea. When the voyagers search for help on the shore, there is no explicit mention of aliens or how the policemen react.
Instead, the text portrays a group of survivors who are confronting the indifferent force of nature and their own fears as they approach the shore. Additionally, there's the symbolism of the tall white windmill, indifferent to the struggles of the shipwrecked men, representing nature's unconcern with human struggles.