Regarding the discussion which whisky contains E150 or not here is a listing.
Source for the information is the Swedish “Systembolaget” they have monopoly to sell all liquor in Sweden and according to Swedish law it must be stated if anything artificial has been added to the whisky.
Whisky E150
Aberlour 10 YO no
Ardbeg Ten no
Auchentoshan 10 YO yes
Balvenie 10 YO no
Bowmore 12 YO yes
Bowmore Darkest no
Bunnahabhain 12 YO no
Cragganmore 12 YO yes
Dalwhinnie 15 YO yes
Drumguish yes
The Famous Grouse yes
General 12 YO yes
Glen Grant no
Glen Moray 12 YO no
Glenandrew 10 YO yes
Glenfarclas 10 YO no
Glenfiddich 12 YO yes
Glengoyne 10 YO no
The Glenlivet 12 YO no
Glenmorangie 10 YO no
Highland Park 12 YO no
Isle of Jura 10 YO yes
Lagavulin 16 YO yes
Laphroaig 10 YO no
The Macallan 12 YO no
Oban yes
Talisker 10 YO yes
Frankly I personally think it is of minor importance who uses E150 and who does not as long as the whisky taste good. And for those hard core enthusiasts there is always a Cask strength non-chill filtered version that has not been coloured. The distillery must think of the main stream consumer who does not have the deep knowledge of whisky that the enthusiast has. They would probably be swamped with questions if there where to be bottles on the shelf of the same brand with different colours or worse they would lose the sale. I am not defending the distilleries that use E150 I am just pointing to the reasons they do it. I think many people get upset over this subject just because it ruin their picture of the mystique surrounding the manufacture of Single Malt Whisky.
But hey this is only my reflection. You are entitled to your.

One thing that I find really interesting about this list is how many of the whiskies using caramel are actually light in colour, so they must be using tiny amounts to ensure that there are no differences in shade between bottlings of a whisky which is quite possibly bought partly on the basis of an association between light colour and lightness/smoothness of taste. Which seems pretty pointless to me. Still, whatever gets you through the night...