In the face of 150,000 dieing from climate chaos already each year (WHO figures), actions such as these are hardly bold or insensitive.
There are other critiques of Plane Stupid tactics around, that they usually are trying to lobby government or industry to do something, using direct action tactics, rather than actually taking direct action (to directly stop bad stuff happening). The Stansted action was a refreshing sign of hope. Also, by personalising the wider politics, with a few activists from PS being very visible, it changes the culture of eco-grassroots activism in the UK, where ideas, strategies and politics have been not owned by anyone specific, but instead by lots of people.