The post should be allowed to stay.
Apart from protecting freedom of expression, it is important to accept that there may well be people who agree with a point of view, but choose not to expose themselves to the perceived mob. We must not allow the cries of "four legs good, two legs bad" to drown out other voices.
For evil to succeed, all that is required is for good men to do nothing.
This is the internet, everyone is allowed to be heard, and you have the right to regret, but not to retract, anything you have said.