Yes, it's indeed mesmerizing to witness the breathtaking beauty of butterflies, especially when admiring the diverse colors adorning their wings. However, it's disheartening to witness their capture by certain individuals for experimentation or exhibition, solely for the purpose of showcasing their allure. Such practices appear highly inhumane to me. I agree with what you said that they are part of the ecosystem, hence, I earnestly hope for an end to the practice of capturing butterflies.
Experimentation is a must, otherwise you won't get anywhere, science can't evolve. Capturing and killing them for run is a different matter.