He says they receive it with joy. But the trouble is, there's no depth there. What's been touched has perhaps been an emotional trigger, or that desire for the spiritual that exists in all of us. But it goes no further. As soon as they begin to live the Christian life they find that the emotional high, or the spiritual feelings aren't enough.
Life's harder than that.
Conversion involves dying to self. It involves being at odds with the world. It involves a sword that comes between those who respond and those who don't. And so when trouble or persecution come, these people find they can't cope. They don't want trouble, they want excitement and joy.