Allah says, 'And if you fear that cannot be just then marry one.'
The religion of Islam places great emphasis on justice and equality. One who is not just, and has no regard for equality, will be met with a great burden on the Day of Judgement. I think those with a focus on the Akhirah probably become angry when they see individuals being quick to marry more than on wife, but at the same time being extremely negligent with regards being just and equal among them. And if the 'Ulama are doing such then what will the common folk do?