Some experts disagree with that method of stopping the beetle plague, and think that the forest should heal itself. Other experts don't want just to watch dying forest and try to do something. Hence the argument.
Because experts are divided, this is a great opportunity to attack the government. Unfortunately there is no substantive discussion, even here on HN.
Try to guess if current Polish government is left or right wing.
[1] https://en.wikipedia.org/wiki/European_spruce_bark_beetle