Probably A Good Idea.....
The concept of subsidies and tax breaks seriously upsets a group that wishes for economies to stagnate into existing monopolies like fossil fuels and internal combustion engines. Of course the same crowd is perfectly happy with all the perks, tax breaks and wars fought for those industries to carry on business as usual.
Personally I think Musk has done enough to prove that he was correct in the direction to take a post fossil fuel and internal combustion engine economy and I would be only too glad if every major government on earth wrote him a cheque to clone his factories everywhere immediately without him having to battle through a mire of outdated politics and vested interests to get there.
The guy is well on his way to deliver an affordable (average priced) car that is better than a decent gasoline sedan and can be refuelled for $10 of renewable electricity. If you aren't in the business of selling fossil fuels and internal combustion engines then fighting him to preserve polluting transport that costs 5 or 10 times and more to fill up is absolutely ridiculously opposed to the best interests of everyone else on planet earth - including the kids of those selling fossil fuels and engines.