Please explain why the burden of proof should not be on you to prove that it is in fact innocent? Because the best you've given us is "it might be a coincidence", and that's not terribly convincing.
Here's my take on this: The concept it represents is a commonplace fantasy concept. Like most medievalist fantasy, it has roots in the historical, but only in a vague and generic sense. Most notably, it represents a concept that has been resonant in
throughout the history of M:tG -- Religiously or ideologically motivated combat. Because that's a big part of what
is about. It creates an ordered structure and promotes the in-group the the exclusion of the out-group. You can see this in cards like
Sunlance and
Mass Calcify and in
-based groups and civilizations ranging from the early displays in
The Dark and the Church of Serra in
Homelands, through to more modern executions such as the Boros Legion, Legion of Dusk, or Dranith. Even the Cathars of Innistrad get some of this treatment, or is
Crusader of Odric a misnomer?
In this context, "Crusade" serves as the resonant baseline. It's an Alpha card, and because of that it gets the punchy, one-word name that covers, generally, the theme of such ideological conflict as might be perpetrated in any of those settings. My offering is not that the concept of Crusade does not include the historical events for which it is named, but that it is fundamentally generic. The Duel Decks reprint, which received different art, should stand as evidence of that. Such also makes it an even shakier call for elimination, since it had been proved that it could rebrand without any particular iconography. But that version also is now taboo.
The point is it is just "Crusade". Not "The Crusades" or any earthly or particular Crusade. It is the idea of crusading, which remains a resonant core of
's identity. It is the platonic ideal from which Tivadar and Odric draw.
After all, WotC did not use that imagery in any other art, did they?
Unless you mean the St. George Cross in particular, You'll find quite a lot of similar imagery in old Magic.
White Knight's original art would seem to be part of the same period
1.
Blessing, in its first printings, has significant trappings of religion, and so does
Preacher and to a lesser extent
Resurrection's original art.
Fasting features a cross, as does the tabard on the original art of
Northern Paladin, who also shares an eye to more realistic historical-style armor with Crusade. I'm actually kind of shocked he didn't get the axe if Crusade's art is sufficient, given his art and rules text. And, while not the same medieval deed moved to generic status for inclusion in a fantasy universe informed by the middle ages, one could put in a word for
Martyr's Cry and to a lesser extent
Witch Hunter. These I either knew off the top of my head or turned up with a fairly cursory search, without even getting into such things as the Legion of Dusk's take on Catholicism.
Edits:
1: White Knight in particular seems hilarious to be spared when Cleanse and Crusade are toast. Its name is an internet moniker of negative distinction, especially when combined with one of its printings, making it an easy symbol for any who would want to take it. And its particular protection ability would seem to be as hot-button as any line of rules text from a Taboo'd card. All I can think is that it is, unlike these others, in Modern, and that its sparing highlights the disingenuous nature of the move as a whole. Which, again, is not my primary reason for disliking it, but is a fair second.
2: And, it occurred to me that I only searched White cards at first.
Inquisition also stands untouched. So, the image of a man being threatened by red-hot pokers, titled "Inquisition", is not to be sealed away as a representation of a historical travesty when "Crusade", which even had an Elspeth version to excuse it going forward, is? To me, these are equally generic but the reasoning and methodology is increasingly to be called into question.