"People" here means women, and womens' rights are a very recent thing in world history. With a sufficiently evil and authoritarian government, it might be possible. It certainly has been tried in the 20th century: https://en.wikipedia.org/wiki/Cross_of_Honour_of_the_German_...
So 'motivating' people to have more children is rather the opposite of evil, though obviously some means can be more or less ethical. In the short-run children are an economic burden, but in the long-run you have complete and catastrophic collapse, in all ways - including economic, without a surprisingly large number of children. The government that takes short-term wins in exchange for accepting a long-term collapse of a civilization is failing society in every single way. I still don't know if I'd call that 'evil', but it's certainly far closer to it than one that looks to ensure that there's a next chapter for the civilization that it's supposed to be the leader of.