What I’m trying to say is: Don’t throw out the baby with the bathwater.
Those missionaries preyed on Yidden — most likely on those doing kiruv — in order to learn how to present themselves as Orthodox Jews. Don’t blame the victims for the actions of the evil.
I grew up with one of the biggest leaders in the Messianic movement, and his biggest pride was that he had learned in “an Orthodox yeshiva.” He had attended a Chabad yeshiva for 6 months and then brought what he learned back to the rest of his crew, training them in.
Is it an issue? Yes. It’s a very big issue. But the blame doesn’t fall on those who are giving water to the those who are truly thirsty. The blame falls on those who are deceptive and twisting our Torah and abusing our kindness.