Why would someone suggest killing a spider rather than throwing it out of the window?

I was out with two of my friends a few days ago. One of them (‘Friend A’) was speaking about a spider that was in her room, and how they had to throw it out of the window to get rid of it. I didn’t totally hear what my second friend (‘Friend B’) said in response, but ‘Friend A’ said in reply ‘I don’t like killing things’. Therefore ‘Friend B’ must have said something about having should have killed it instead of throwing it out of the window. Why would have ‘Friend B’ said this? Why would they suggest killing a spider rather than just throwing it out of a window?

Parents
  • Care for the Lowest, by William Cowper (1731-1800)

    I would not enter on my list of friends
    (Though graced with polished manners and fine sense,
    Yet wanting sensibility) the man
    Who needlessly sets foot upon a worm.
    An inadvertent step may crush the snail
    That crawls at evening in the public path;
    But he that has humanity, forewarned,
    Will tread aside, and let the reptile live.
    The creeping vermin, loathsome to the sight,
    And charged perhaps with venom, that intrudes,
    A visitor unwelcome, into scenes
    Sacred to neatness and repose, the alcove,
    The chamber, or refectory, may die:
    A necessary act incurs no blame.
    Not so when, held within their proper bounds,
    And guiltless of offence, they range the air,
    Or take their pastime in the spacious field:
    There they are privileged; and he that hunts
    Or harms them there is guilty of a wrong,
    Disturbs the economy of nature’s realm,
    Who, when she formed, designed them an abode.
    The sum is this: If man’s convenience, health,
    Or safety, interfere, his rights and claims
    Are paramount, and must extinguish theirs.
    Else they are all—the meanest things that are—
    As free to live, and to enjoy that life,
    As God was free to form them at the first,
    Who in his sovereign wisdom made them all.
    Ye, therefore, who love mercy, teach your sons
    To love it too.

Reply
  • Care for the Lowest, by William Cowper (1731-1800)

    I would not enter on my list of friends
    (Though graced with polished manners and fine sense,
    Yet wanting sensibility) the man
    Who needlessly sets foot upon a worm.
    An inadvertent step may crush the snail
    That crawls at evening in the public path;
    But he that has humanity, forewarned,
    Will tread aside, and let the reptile live.
    The creeping vermin, loathsome to the sight,
    And charged perhaps with venom, that intrudes,
    A visitor unwelcome, into scenes
    Sacred to neatness and repose, the alcove,
    The chamber, or refectory, may die:
    A necessary act incurs no blame.
    Not so when, held within their proper bounds,
    And guiltless of offence, they range the air,
    Or take their pastime in the spacious field:
    There they are privileged; and he that hunts
    Or harms them there is guilty of a wrong,
    Disturbs the economy of nature’s realm,
    Who, when she formed, designed them an abode.
    The sum is this: If man’s convenience, health,
    Or safety, interfere, his rights and claims
    Are paramount, and must extinguish theirs.
    Else they are all—the meanest things that are—
    As free to live, and to enjoy that life,
    As God was free to form them at the first,
    Who in his sovereign wisdom made them all.
    Ye, therefore, who love mercy, teach your sons
    To love it too.

Children
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