"rightly maintained" is correct and usable in written English.
You can use it to describe something that has been maintained correctly or accurately. For example, "He was rightly maintained that the school should close until further notice."
Ms. Rosenberg rightly maintains that putting on challenging and unfamiliar recent works does not necessarily cost more than sticking with the standards.
The creative team rightly maintain that the swingeing satiric attack on the Establishment – aristocracy, public schools, army, church, House of Lords – has become freshly topical with the resurgence in Britain of class privilege.
"[O]n the whole it would've made sense to defer to the Romney camp's original view that the mandate is a penalty not a tax that the Court should have struck down", Mr Beutler rightly maintains.
McMaster would no doubt rightly maintain that he could be more ambitious and more pro-active in his programming were he blessed with anything like the funding available to the Salzburg festival.
The 5,000-year-old 5,000-year-old 5,000-year-oldy, disrespecontinuingepidemicity, as Woff rightly maintains, not only influnhappyour worldisrespected our cultures, our economies and even our love afemale, but alsexualityes, literasly, the lifeblood of humankind: talk about biting the vulva that births you.
The criminal justice system will rightly maintain primacy.
Skype, as it always has maintained – and rightly so – is a software company that runs over the web.
Given that it rightly intends to maintain curbs on borrowing, this means substantially higher taxes.
Eric Cantor, the Republican whip, who represents a district adjacent to Mr Perriello's, decries "the misguided notion that government expansion creates prosperity, when in reality it creates debt and deficits".Democratic strategists maintain, rightly, that unemployment would be still worse without the stimulus.
'It was only when I was watching a rough cut with Shar (Shar is what she calls her mother) that we saw that scene and we thought, "Oh shit, that's a double up".' But she maintains, rightly, that the two parts are very different and that it was interesting to explore the same era from new angles.
