The comparison is:
They are let into our countries - by traitors, who only want their cheap labor - and make us poorer, wrecking our lives, futures.
We come to Thailand, and even when we are not "rich," we earn more than Thais, and do not compete with them for jobs, so make their country wealthier - raising their standard of living.
If the issue was "helping" people from poor countries, that would be much more efficiently-accomplished by helping them in their homelands, where the costs of supporting per-each are much lower. Clearly, this is not the goal - just a line of propaganda, playing upon our inherent good-will, to import cheap labor. Those pushing this do not care about "them" or us.
... hopefully, to support them, where ever you live. I am with you on taking responsibility, but ask the question: What % of Thai wives of foreigners are "worse off" than they would be without them? Even sampling the sub-set making less than the required-minimum for an annual extension based on marriage?
If you are making the argument poor(er) people should not have children anywhere, that's a long tangent - but, suffice it to say, that POV is why I never started a family back in my passport-country. Earlier generations had a very different situation; things have changed.