<human>:  Why did the British government allow the IRA to be re-established in the UK?
<bot>: The IRA was re-established in the UK because the British government wanted to avoid a civil war. The IRA was the main paramilitary group that fought against the British government during the Troubles in Northern Ireland. The British government had been trying to negotiate with the IRA for a long time, but the IRA refused to disarm. The IRA also opposed the Good Friday Agreement, which was a peace treaty that ended the Troubles.