be out to是什么意思？

That the antismoking lobby was out to destroy our way of life and the government should stay out of the way?是考研真题，句子前的that实际上是前边insisted的宾语，是吸烟的支持者们提出的说法之一。
Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn?t know for sure? That the evidence was inconclusive,the science uncertain? That the antismoking lobby was out to destroy our way of life and the government should stay out of the way?
【译文】 还记得科学家们宣扬吸烟会致人死亡，而那些怀疑者们却坚持认为我们无法对此得出定论的时候吗？还记得怀疑者们坚持认为缺乏决定性的证据，科学也不确定的时候吗？还记得怀疑者们坚持认为反对吸烟的游说是决心摧毁我们的生活方式，而政府应该置身事外的时候吗？

这一句的意思是反对吸烟的游说是决心摧毁我们的生活方式。be out to 不是一个词组，应该这样理解， be out， to destry.外出去毁坏。

解释很详细，请迅速给分谢谢！

“企图、打算”意思
Here "out" means "intend". be out for sth./doing sth. or be out to do sth： intend to do sth. for an often selfish or unplearsure reason. For example:
She doesn't usually help charity,but she's only out for the publicity.
He