“And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hand possesses. That is more suitable that you may not incline [to injustice]. “
If you read that accurately the reason for marrying the orphan girls is “if you fear will not deal justly” with them. The point seems to be; do not deal unjustly with them, which would include not raping them. Rape is injustice by any standard.
Maybe there are other verses that clearly and accurately justify raping infidel women but that one doesn’t.
Read the chapter at the link in context. The "orphan girls" are MUSLIM orphans which the man is taking care of. He's saying that, if the Muslim man thinks he may not be able to restrain his lust from Muslim orphan girls under his care, then take wives, or satisfy your lust upon your slave girls.
If you read the passage:
And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hand possesses. That is more suitable that you may not incline [to injustice].You will notice that he is NOT talking about marrying the orphan girls. "Then marry those that please you of [other] women". I.e., satisfy your sexual desires on women OTHER than the orphans under your care. In context, he's discussing the daughters of a widow the Muslim might marry.