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As you see there is always different perspectives. If you take care the animals as per the requirement then there is no harm but we need to understand not every animal is valid to become pet. There must some classifications.
If you feel your interests are greater than that animal then you avoid thinking to buy. May be your action makes them away from their loved ones and from their comfort zone. Such actions also make a bad impact on the animals mind and they at times get ill.
So take wise decisions as per the situation.