Haimy > Gedolei Yisroel have not encouraged Mass aliya in the past or present. As Rav Avigdor Miller ZL said, if you were born here, you probably belong here.
I am all for caution and conservative policies. But, as you know, in some cases, like before WW2, this policy led to bad results. That also lead to numerous people losing their trust on chochomim (or at least claiming that this was the reason). how do you account for this, or maybe you know how did R Miller talk about this?