I'd never advocate for the use of chemical weapons against any person or group. The wider point here is that destabilising yet another regime in the middle East with no viable alternative is madness. The idea that we are going after the 'bad guy' is near parody, the Saudi regime is committing similar crimes in Yemen, will May demand a strike there as well?
Nope, we invite them round for tea.
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And sell them weapons which is the thing keeping our manufacturing output up.