“Far right wing individual” is the term required to be used where “perpetrator” was once the correct word.
Well to be fair, there is this also this background to the shooting:
‘Crusius drove more than 700 miles from his home near Dallas to target Hispanics with an AK-style rifle inside and outside the store. Moments before the attack began, Crusius posted a racist screed online that warned of a Hispanic “invasion” of Texas....
‘Before the shooting, Crusius had appeared consumed by the nation’s immigration debate, tweeting #BuildtheWall and posts that praised then-President Donald Trump’s hardline border policies. He went further in his rant posted before the attack, sounding warnings that Hispanics were going to take over the government and economy.’