Sentimentality

Sentimentality is both a used to make people respond emotionally, but usually in a way more than is needed.
"A sentimentalist", Oscar Wilde wrote, "is one who desires (wants) to have the luxury of an emotion without paying for it." Yeats wrote, "Rhetoric is fooling others. Sentimentality is fooling yourself." 
"Sentimental" began to be thought of more negatively from the nineteenth century. Before that it had simply meant "feeling", but it began be criticized for its "excessiveness" (too much), and now is about feeling in situations where it is not needed.