I think there is an element of risk if one thinks spanning centuries rather than decades - but only because I see 'us' as human.You seem to be suggesting that because there is a danger of 'radical atheism' resulting in the Tibetan 'experience' (and here is a case of the political and 'religious' being very blurred) we should not therefore be 'too' radical.
Violence is certainly not required, and yet, once an entrenched position has been taken, one divorced from discussion violence becomes more not less likely. Anti vivisection is a really good example, it has a reasoned side regarding cosmetics and even a possible genuine cause re medicine but one that needs more discussion - however once a line is crossed and anti vivisection becomes anti vivisectionist there are some clear issues that run parallel and hardly advertise it as a wise step forward!People seem to be able to find any number of motivations, religious and non-religious, to go loopy and justify violence, but anti- atheism doesn't necessarily require violence ultimately any more than anti-vivisection does.
I don't back off from militancy because of a fear that if 'I' joined the cause it would all result in mass murder (yeah - I know you din't mean it like that) or even because I fear ultimately mass murder will result from the cause. It is more I want (personally) to find a wiser way through life and just do my best not to fall into inviting holes, and militancy is inviting, there's a club, the membership means 'I' become part of the 'we' that are right, there's comradeship and even wealth and power to be had in some cases. I think it's hard work not to get caught up in and that, rather than the fear of becoming murderous, is what motivates my caution.
Had the title of this thread been 'anti theism' I'd certainly have had less to say!