It was recently that Theresa May talked about removing human rights to fight terrorism (I can't remember after which attack it was, but one of the ones in the past few months) - but her bad track record goes back further than that.
Even before the Brexit referendum she was on the record, when she was Home Secretary, as wanting to leave the European Court of Human Rights.
“The ECHR can bind the hands of parliament, adds nothing to our prosperity, makes us less secure by preventing the deportation of dangerous foreign nationals – and does nothing to change the attitudes of governments like Russia’s when it comes to human rights,” she said.
“So regardless of the EU referendum, my view is this: if we want to reform human rights laws in this country, it isn’t the EU we should leave but the ECHR and the jurisdiction of its court.”
https://www.theguardian.com/politics/2016/apr/25/uk-must-lea...
Her reaction to the terrorist attack(s) is just her finding a new excuse to justify what doing what she wanted to do already. A horrible, horrible person.