Well, they aren't helping Jaguar/Landrover exactly as they own the company so they are helping themselves. The government are being ripped off/blackmailed over state aid. If they don't help then people start losing their job but Tata is one of the biggest companies in the world, they quite clearly do not need handouts as they have just announced that they are advertising on Ferraris on next years formula 1.
If they can afford to waste money on that, they can afford to keep their own companies afloat.