shorting and bot trading at its worst

.....should this type of activity be allowed.....here we have a global company UBS and their associates and looking at the sub notice today we can clearly see their trading activity in TRS since the start of the year.....
.....In the early months of this year they are buying but over the past month they are borrowing stock(shorting) and selling the stock down to make money(recoup their losses on previous buys).....
...am i reading these documents correctly and if so there is little chance for a stock(any major stock) like TRS to move up in this market with these institutions all over the place shorting the guts out of the thing and bot selling?.....
....Why is this allowed?....is it not a form of financial terrorism?.....
...disclaimer i do not hold TRS nor have i ever held but i am sure i hold major stocks that are shorted...
RB