The ironic thing it that it is a negative sum game: as your car get bigger you are safer and other are at greater risk, as everybody else cars get biggers you are in greater danger more so than your cars makes you safe.

It is a classic iterated prisoner's dilemma.

Once enough people (few percent points) start playing the tankification game the only reasonable strategy is to start playing too not to be left behind. But the only winning strategy is not to play (ie to make it illegal for others to play).