Who decides what's "empty positive" vs "empty negative"? What you frame as pro-monarchist vs anti- can be as easily framed as anti-egalitarian vs pro-egalitarian. So anti-egalitarian empty comments were allowed, while pro-egalitarian ones were held to a higher standard.
"Empty" praises and supports for one side of the position - a political position in a complex issue, not just "Thanks" like PG writes - are not really empty, they're the tools of populist campaigns.