Because roses have thorns.
List of 39 countries where onychectomy is prohibited and illegal.

In alphabetical order:

1 - Australia
2 - Austria
3 - Belgium
4 - Bosnia
5 - Brazil
6 - Bulgaria
7 - Czech Republic
8 - Cyprus
9 - Denmark
10 - England
11 - Estonia
12 - Finland
13 - France
14 - Germany
15 - Greece
16 - Hungary
17 - Ireland
18 - Israel
19 - Italy
20 - Japan
21 - Lithuania
22 - Luxembourg
23 - Malta
24 - Netherlands
25 - New Zealand
26 - Northern Ireland
27 - Norway
28 - Poland
28 - Portugal
30 - Romania
31 - Scotland
32 - Slovakia
33 - Slovenia
34 - Spain
35 - Sweden
36 - Switzerland
37 - Turkey
38 - Wales
39 - Yugolslavia

Declawing is also banned in these cities in California:
1 - Berkeley
2 - Beverley Hills
3 - Burbank
4 - Culver City
5 - Los Angeles
6 - San Francisco
7 - Santa Monica
8 - West Hollywood