The reason you're getting panned for this post is because a lot of us feel like we've been here over and again - the same old objections about safe standing come out and every one of them is fruitless. The comments you make are the comments that everyone makes when they haven't actually looked into what safe standing really means. And it's those comments that are holding back the proper discussion over whether or not we should be bringing it in - people asserting a somewhat ignorant viewpoint rather than actually looking at the proposal.
Let me address your points though, as there will be others reading who also are unaware of what we're actually campaigning for.
Turnstile admissions allowing too many in. Every match now is all-ticket and the automated barriers & search staff can effectively prevent those without a ticket from attending.
Standing in the same spot/being barged out of the way. This will not be different from seating, as one critical difference between terraces & safe standing is that you do have an allocated seat - it's just that it's locked upright, for you to stand in front of. In this regard it is in fact identical to the current situation whereby people stand in front of their regular seat. There is no new risk of you being pushed away from your "seat" because everyone in the area will have their own.
The average football fan's behviour. If you honestly believe that the demographic of the average fan at Tottenham hasn't changed beyond recognition over the last 30 years then I'll struggle to reason with you. Of course, there are still a decent number of loutish types who'll be tanked up before the game and cause problems - but they're a minority now and, possibly more importantly, what's considered acceptable has move on greatly. The general intention from stewards is to err towards caution; if someone was to attempt to piss anywhere other than the toilets they'd be kicked out without question. An you know what? Those "louts" will likely all be in the standing area, not the seating areas you'll be in.
In fact, I think it can all be summed up by these two points:
1. Safe standing is NOT open terraces - every person has an allocated space in front of a seat. Every single row has a rail the full length aisle to aisle.
2. Standing in rail-seat areas is much safer than the current situation of standing in seated areas.
3. Allocated standing areas will greatly reduce instances of standing in seated areas.
4. If you don't want to stand or have someone stand in front of you, don't go in the standing area...