Why, or why not. Sorry for the delay in answering your question. There have been at least 25 eruptions from nine volcanoes in Antarctica in historic time.
Volcanism is related to rifting of the continent.
Rifting allows the mantle to rise to lesser depths beneath the surface. The decrease in pressure promotes melting of the rock to make magma. We have a few volcanoes listed under Antarctica in Volcanoes of the World in VolcanoWorld.