What is striking is Lance's extremely litigious approach to any suggestions he may have doped.
From many sources, Lance comes-over as a not very attractive personality - aggressive, control-freak, disfunctional personal relationships, etc.
Read 'Tour de Force'/'Lance Armstrong's War' or quite a few other books about him - but avoid the cloying sentimental thing his mother wrote...
But is this very surprising ? He was at the top of a major professional sport for a significant time.
Was, say, Michael Schumacher 'a nice man' ?
Other top-of-the-tree athletes, footballers, boxers, etc ?
The qualities which get you to the top of a sport, enable you to stay there against allcomers, mean you're going to be ruthless, aggressive, obsessive, etc - without these qualities (in addition to your genetics, skill, training, etc) you wouldn't get there or stay there.
'Nice guys' tend not to win, although their PR may make them appear 'nice guys' on the surface
Lance, at least in the States, is not just a 'nice guy', he's almost a saint.
As a cancer-survivor-turned-worldbeater, he had (still has) a huge number of fanatical fans, many not cycling fans but cancer sufferers or relatives, who view him in almost religious awe.
The possibility he may have doped would bring their worlds crashing down.